[PATCH] splice: unlikely() optimizations

Also corrects a few comments. Patch mainly from Ingo, changes by me.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Jens Axboe <axboe@suse.de>

diff --cc fs/read_write.c
Simple merge

diff --cc fs/splice.c
Simple merge