io_uring: Remove unneeded test in io_run_task_work_sig()

Avoid testing TIF_NOTIFY_SIGNAL twice by calling task_sigpending()
directly from io_run_task_work_sig()

Signed-off-by: Olivier Langlois <olivier@trillion01.com>
Link: https://lore.kernel.org/r/bd7c0495f7656e803e5736708591bb665e6eaacd.1645041650.git.olivier@trillion01.com


Signed-off-by: Jens Axboe <axboe@kernel.dk>