io_uring: clean up a type in io_uring_register_get_file()

Originally "fd" was unsigned int but it was changed to int when we pulled
this code into a separate function in commit 0b6d253
("io_uring/register: provide helper to get io_ring_ctx from 'fd'").  This
doesn't really cause a runtime problem because the call to
array_index_nospec() will clamp negative fds to 0 and nothing else uses
the negative values.

Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Link: https://lore.kernel.org/r/6f6cb630-079f-4fdf-bf95-1082e0a3fc6e@stanley.mountain
Signed-off-by: Jens Axboe <axboe@kernel.dk>

Author: Dan Carpenter

io_uring/register.c

@@ -561,7 +561,7 @@ static int __io_uring_register(struct io_ring_ctx *ctx, unsigned opcode,
  * true, then the registered index is used. Otherwise, the normal fd table.
  * Caller must call fput() on the returned file, unless it's an ERR_PTR.
  */
-struct file *io_uring_register_get_file(int fd, bool registered)
+struct file *io_uring_register_get_file(unsigned int fd, bool registered)
 {
 	struct file *file;
 

io_uring/register.h

@@ -4,6 +4,6 @@
 
 int io_eventfd_unregister(struct io_ring_ctx *ctx);
 int io_unregister_personality(struct io_ring_ctx *ctx, unsigned id);
-struct file *io_uring_register_get_file(int fd, bool registered);
+struct file *io_uring_register_get_file(unsigned int fd, bool registered);
 
 #endif