Check whether the VMA has a vm_ops before calling close, just
like we check vm_ops before calling open a few dozen lines
higher up in the function.
Signed-off-by: NRik van Riel <riel@redhat.com>
Reported-by: NDan Carpenter <error27@gmail.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>