Fix clippy lints

Signed-off-by: Christopher N. Hesse <[email protected]>

Author: raymanfx

examples/glium.rs

@@ -28,7 +28,7 @@ fn main() -> io::Result<()> {
 
     let dev = RwLock::new(Device::with_path(path)?);
     {
-        let dev = dev.write().unwrap();
+        let dev = dev.read().unwrap();
         format = dev.format()?;
         params = dev.params()?;
 
@@ -126,7 +126,7 @@ fn main() -> io::Result<()> {
     let (tx, rx) = mpsc::channel();
 
     thread::spawn(move || {
-        let dev = dev.write().unwrap();
+        let dev = dev.read().unwrap();
 
         // Setup a buffer stream
         let mut stream = MmapStream::with_buffers(&dev, Type::VideoCapture, buffer_count).unwrap();

src/v4l2/api.rs

@@ -270,7 +270,7 @@ pub unsafe fn mmap(
     offset: libc::off_t,
 ) -> io::Result<*mut std::os::raw::c_void> {
     let ret = detail::mmap(start, length, prot, flags, fd, offset);
-    if ret as usize == std::usize::MAX {
+    if ret as usize == usize::MAX {
         Err(io::Error::last_os_error())
     } else {
         Ok(ret)