locks: fix NULL-deref in generic_delete_lease
commit 0efaa7e8 locks: generic_delete_lease doesn't need a file_lock at all moves the call to fl->fl_lmops->lm_change() to a place in the code where fl might be a non-lease lock. When that happens, fl_lmops is NULL and an Oops ensures. So add an extra test to restore correct functioning. Reported-by: Linda Walsh <suse@tlinx.org> Link: https://bugzilla.suse.com/show_bug.cgi?id=912569 Cc: stable@vger.kernel.org (v3.18) Fixes: 0efaa7e8Signed-off-by: NeilBrown <neilb@suse.de> Signed-off-by: Jeff Layton <jlayton@primarydata.com>
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