UPSTREAM: io_uring: remove duplicated calls to io_kiocb_ppos

commit af9c45ec upstream.

io_kiocb_ppos is called in both branches, and it seems that the compiler
does not fuse this. Fusing removes a few bytes from loop_rw_iter.

Before:
$ nm -S fs/io_uring.o | grep loop_rw_iter
0000000000002430 0000000000000124 t loop_rw_iter

After:
$ nm -S fs/io_uring.o | grep loop_rw_iter
0000000000002430 000000000000010d t loop_rw_iter

Change-Id: If105cc8a6388490c7860d820a7d5de4d28d9d7c0
Signed-off-by: Dylan Yudaken <dylany@fb.com>
Reviewed-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
(cherry picked from commit b7958caf)
Bug: 268174392
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>