wayland: ignore errors when reading socket

On Phosh, the EWOULDBLOCK error may be emitted when reading from the
Wayland socket, which is not fatal. Ignore errors encountered while
reading, as fatal errors would be emitted by other operations in the
main loop.

src/ufkbd_gnome.rs

@@ -87,7 +87,8 @@ async fn main()
             poller.delete(fd).unwrap();
 
             if !events.is_empty() {
-                guard.read().unwrap();
+                // This may still emit EWOULDBLOCK errors.
+                let _ = guard.read();
                 queue.dispatch_pending(&mut dispatcher).unwrap();
             }
 

src/ufkbd_wl.rs

@@ -57,7 +57,8 @@ fn main()
         poller.delete(fd).unwrap();
 
         if !events.is_empty() {
-            guard.read().unwrap();
+            // This may still emit EWOULDBLOCK errors.
+            let _ = guard.read();
             queue.dispatch_pending(&mut dispatcher).unwrap();
         }