Add debug in Debug and MappedRegion

Signed-off-by: Patrick José Pereira <patrickelectric@gmail.com>

Author: patrickelectric

src/lib.rs

@@ -287,6 +287,7 @@ enum State {
     Aborted,
 }
 
+#[derive(Debug)]
 pub struct Camera {
     fd: RawFd,
     state: State,

src/v4l2.rs

@@ -95,6 +95,7 @@ pub fn xioctl_valid<T>(fd: RawFd, request: usize, arg: &mut T) -> io::Result<boo
     }
 }
 
+#[derive(Debug)]
 pub struct MappedRegion {
     pub ptr: *mut u8,
     pub len: usize,