Fix clippy warning (#86)

* Fix clippy improvements warnings

examples/epd2in13_v2.rs

@@ -79,7 +79,7 @@ fn main() -> Result<(), std::io::Error> {
     display.set_rotation(DisplayRotation::Rotate270);
     draw_text(&mut display, "Rotate 270!", 5, 50);
 
-    epd2in13.update_frame(&mut spi, &display.buffer(), &mut delay)?;
+    epd2in13.update_frame(&mut spi, display.buffer(), &mut delay)?;
     epd2in13
         .display_frame(&mut spi, &mut delay)
         .expect("display frame new graphics");
@@ -133,7 +133,7 @@ fn main() -> Result<(), std::io::Error> {
         draw_text(&mut display, "  Hello World! ", 5 + i * 12, 50);
 
         epd2in13
-            .update_and_display_frame(&mut spi, &display.buffer(), &mut delay)
+            .update_and_display_frame(&mut spi, display.buffer(), &mut delay)
             .expect("display frame new graphics");
         delay.delay_ms(1_000u16);
     }
@@ -142,7 +142,7 @@ fn main() -> Result<(), std::io::Error> {
     // the screen can refresh for this kind of change (small single character)
     display.clear_buffer(Color::White);
     epd2in13
-        .update_and_display_frame(&mut spi, &display.buffer(), &mut delay)
+        .update_and_display_frame(&mut spi, display.buffer(), &mut delay)
         .unwrap();
 
     let spinner = ["|", "/", "-", "\\"];
@@ -150,7 +150,7 @@ fn main() -> Result<(), std::io::Error> {
         display.clear_buffer(Color::White);
         draw_text(&mut display, spinner[i % spinner.len()], 10, 100);
         epd2in13
-            .update_and_display_frame(&mut spi, &display.buffer(), &mut delay)
+            .update_and_display_frame(&mut spi, display.buffer(), &mut delay)
             .unwrap();
     }
 

examples/epd2in13bc.rs

@@ -94,7 +94,7 @@ fn main() -> Result<(), std::io::Error> {
     // the bw-buffer of this tri-color screen
 
     epd2in13
-        .update_and_display_frame(&mut spi, &display.bw_buffer(), &mut delay)
+        .update_and_display_frame(&mut spi, display.bw_buffer(), &mut delay)
         .expect("display frame new graphics");
 
     println!("First frame done. Waiting 5s");

examples/epd4in2.rs

@@ -79,7 +79,7 @@ fn main() -> Result<(), std::io::Error> {
     display.set_rotation(DisplayRotation::Rotate270);
     draw_text(&mut display, "Rotate 270!", 5, 50);
 
-    epd4in2.update_frame(&mut spi, &display.buffer(), &mut delay)?;
+    epd4in2.update_frame(&mut spi, display.buffer(), &mut delay)?;
     epd4in2
         .display_frame(&mut spi, &mut delay)
         .expect("display frame new graphics");
@@ -135,7 +135,7 @@ fn main() -> Result<(), std::io::Error> {
         draw_text(&mut display, "  Hello World! ", 5 + i * 12, 50);
 
         epd4in2
-            .update_frame(&mut spi, &display.buffer(), &mut delay)
+            .update_frame(&mut spi, display.buffer(), &mut delay)
             .unwrap();
         epd4in2
             .display_frame(&mut spi, &mut delay)

examples/epd4in2_variable_size.rs

@@ -84,7 +84,7 @@ fn main() -> Result<(), std::io::Error> {
     draw_text(&mut display, "Rotate 270!", 5, 50);
 
     epd4in2
-        .update_partial_frame(&mut spi, &display.buffer(), x, y, width, height)
+        .update_partial_frame(&mut spi, display.buffer(), x, y, width, height)
         .unwrap();
     epd4in2
         .display_frame(&mut spi, &mut delay)
@@ -140,7 +140,7 @@ fn main() -> Result<(), std::io::Error> {
         draw_text(&mut display, "  Hello World! ", 5 + i * 12, 50);
 
         epd4in2
-            .update_partial_frame(&mut spi, &display.buffer(), x, y, width, height)
+            .update_partial_frame(&mut spi, display.buffer(), x, y, width, height)
             .unwrap();
         epd4in2
             .display_frame(&mut spi, &mut delay)

src/epd2in13bc/mod.rs

@@ -255,7 +255,7 @@ where
     ) -> Result<(), SPI::Error> {
         self.interface.cmd(spi, Command::DataStartTransmission1)?;
 
-        self.interface.data(spi, &buffer)?;
+        self.interface.data(spi, buffer)?;
 
         // Clear the chromatic layer
         let color = self.color.get_byte_value();

src/epd2in9bc/mod.rs

@@ -258,7 +258,7 @@ where
     ) -> Result<(), SPI::Error> {
         self.interface.cmd(spi, Command::DataStartTransmission1)?;
 
-        self.interface.data(spi, &buffer)?;
+        self.interface.data(spi, buffer)?;
 
         // Clear the chromatic layer
         let color = self.color.get_byte_value();

src/graphics.rs

@@ -300,7 +300,7 @@ impl<'a> OriginDimensions for VarDisplay<'a> {
 
 impl<'a> Display for VarDisplay<'a> {
     fn buffer(&self) -> &[u8] {
-        &self.buffer
+        self.buffer
     }
 
     fn get_mut_buffer(&mut self) -> &mut [u8] {