io_uring: unexport io_req_cqe_overflow()

There are no users of io_req_cqe_overflow() apart from io_uring.c, make
it static.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/f4295eb2f9eb98d5db38c0578f57f0b86bfe0d8c.1712708261.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

Author: isilence

io_uring/io_uring.c

@@ -819,7 +819,7 @@ static bool io_cqring_event_overflow(struct io_ring_ctx *ctx, u64 user_data,
 	return true;
 }
 
-void io_req_cqe_overflow(struct io_kiocb *req)
+static void io_req_cqe_overflow(struct io_kiocb *req)
 {
 	io_cqring_event_overflow(req->ctx, req->cqe.user_data,
 				req->cqe.res, req->cqe.flags,

io_uring/io_uring.h

@@ -62,7 +62,6 @@ static inline bool io_should_wake(struct io_wait_queue *iowq)
 }
 
 bool io_cqe_cache_refill(struct io_ring_ctx *ctx, bool overflow);
-void io_req_cqe_overflow(struct io_kiocb *req);
 int io_run_task_work_sig(struct io_ring_ctx *ctx);
 void io_req_defer_failed(struct io_kiocb *req, s32 res);
 bool io_post_aux_cqe(struct io_ring_ctx *ctx, u64 user_data, s32 res, u32 cflags);