locks: rename lock-manager ops

Both the filesystem and the lock manager can associate operations with a
lock.  Confusingly, one of them (fl_release_private) actually has the
same name in both operation structures.

It would save some confusion to give the lock-manager ops different
names.

Signed-off-by: J. Bruce Fields <bfields@redhat.com>
diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 82a6646..9150865 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -1495,7 +1495,7 @@
 	pid_t pid = fl->fl_type != F_UNLCK ? current->tgid : 0;
 	int err;
 
-	if (fl->fl_lmops && fl->fl_lmops->fl_grant) {
+	if (fl->fl_lmops && fl->fl_lmops->lm_grant) {
 		/* NLM needs asynchronous locks, which we don't support yet */
 		return -ENOLCK;
 	}