Fix new kernel-doc warning in fs/splice.c:

  Warning(fs/splice.c:1298): No description found for parameter 'opos'
Signed-off-by: NRandy Dunlap <rdunlap@infradead.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>