apply clippy fixes

Signed-off-by: David Cohen <dacohen@pm.me>

examples/basic.rs

@@ -58,16 +58,14 @@ fn main() {
                 error
             );
         }
-    } else {
-        if let Err(error) = window
-            .subsystem()
-            .gl_set_swap_interval(SwapInterval::Immediate)
-        {
-            println!(
-                "Failed to gl_set_swap_interval(SwapInterval::Immediate): {}",
-                error
-            );
-        }
+    } else if let Err(error) = window
+        .subsystem()
+        .gl_set_swap_interval(SwapInterval::Immediate)
+    {
+        println!(
+            "Failed to gl_set_swap_interval(SwapInterval::Immediate): {}",
+            error
+        );
     }
 
     let start_time = Instant::now();

examples/mix/triangle.rs

@@ -9,15 +9,15 @@ use std::mem;
 use std::ptr;
 use std::str;
 
-const VS_SRC: &'static str = "
+const VS_SRC: &str = "
 #version 150
 in vec2 position;
 
 void main() {
     gl_Position = vec4(position, 0.0, 1.0);
 }";
 
-const FS_SRC: &'static str = "
+const FS_SRC: &str = "
 #version 150
 out vec4 out_color;
 

src/painter.rs

@@ -571,7 +571,7 @@ impl Painter {
 
     fn generate_gl_texture2d(
         gl_id: &mut Option<GLuint>,
-        pixels: &Vec<u8>,
+        pixels: &[u8],
         width: i32,
         height: i32,
         filtering: bool,