fs: use correct __poll_t type

Fix the following sparse warnings by using __poll_t instead
of unsigned type.

fs/eventpoll.c:541:9: sparse: warning: restricted __poll_t degrades to integer
fs/eventfd.c:67:17: sparse: warning: restricted __poll_t degrades to integer

Signed-off-by: Min-Hua Chen <[email protected]>
Message-Id: <[email protected]>
Signed-off-by: Christian Brauner <[email protected]>
3 files changed