Clean up some repeated code related to HugeTLB.  hugetlb_zero_setup would
have already allocated the file->f_op.

Signed-off-by: Krishnakumar. R <rkrishnakumar@gmail.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>