Clean up some issues pointed out by Clippy

Author: sirhcel

src/posix/poll.rs

@@ -48,7 +48,7 @@ fn wait_fd(fd: RawFd, events: PollFlags, timeout: Duration) -> io::Result<()> {
         Some(_) | None => (),
     }
 
-    Err(io::Error::new(io::ErrorKind::Other, EIO.desc()))
+    Err(io::Error::other(EIO.desc()))
 }
 
 /// Poll with a duration clamped to the maximum value representable by the `TimeSpec` used by

src/posix/tty.rs

@@ -500,7 +500,7 @@ impl io::Write for TTYPort {
                         ))
                     }
                 }
-                Err(_) => Err(io::Error::new(io::ErrorKind::Other, "flush failed")),
+                Err(_) => Err(io::Error::other("flush failed")),
             };
         }
     }

src/windows/com.rs

@@ -46,7 +46,7 @@ impl COMPort {
     /// ## Errors
     ///
     /// * `NoDevice` if the device could not be opened. This could indicate that
-    ///    the device is already in use.
+    ///   the device is already in use.
     /// * `InvalidInput` if `port` is not a valid device name.
     /// * `Io` for any other I/O error while opening or initializing the device.
     pub fn open(builder: &SerialPortBuilder) -> Result<COMPort> {