Support &mut [Event] epoll buffers

Signed-off-by: Alex Saveau <[email protected]>

Author: SUPERCILEX

src/event/epoll.rs

@@ -480,6 +480,19 @@ mod buf {
         }
     }
 
+    impl<'a> EventBuffer for &'a mut [Event] {
+        type Out = &'a mut [Event];
+
+        fn convert(&mut self) -> &mut [MaybeUninit<Event>] {
+            // SAFETY: we (and the kernel) never uninitialize any values
+            unsafe { core::mem::transmute::<&mut [Event], &mut [MaybeUninit<Event>]>(self) }
+        }
+
+        unsafe fn filled(self, count: usize) -> Self::Out {
+            &mut self[..count]
+        }
+    }
+
     impl<'a> EventBuffer for &'a mut [MaybeUninit<Event>] {
         type Out = &'a mut [Event];