io_uring: io_kiocb_update_pos() should not touch file for non -1 offset
-1 tells use to use the current position, but we check if the file is a stream regardless of that. Fix up io_kiocb_update_pos() to only dip into file if we need to. This is both more efficient and also drops 12 bytes of text on aarch64 and 64 bytes on x86-64. Fixes: b4aec400 ("io_uring: do not recalculate ppos unnecessarily") Signed-off-by: Jens Axboe <axboe@kernel.dk>
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