userfaultfd: add missing mmput() in error path
This fixes a memleak if anon_inode_getfile() fails in userfaultfd(). Signed-off-by: Eric Biggers <ebiggers3@gmail.com> Signed-off-by: Andrea Arcangeli <aarcange@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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