dlm: fix possible call to kfree() for non-initialized pointer

[ Upstream commit 58a923adf4d9aca8bf7205985c9c8fc531c65d72 ]

Technically dlm_config_nodes() could return error and keep nodes
uninitialized. After that on the fail path of we'll call kfree()
for that uninitialized value.

The patch is simple - we should just initialize nodes with NULL.
Signed-off-by: NDenis V. Lunev <den@openvz.org>
Signed-off-by: NDavid Teigland <teigland@redhat.com>
Signed-off-by: NSasha Levin <sashal@kernel.org>

fs/dlm/member.c

@@ -671,7 +671,7 @@ int dlm_ls_stop(struct dlm_ls *ls)
 int dlm_ls_start(struct dlm_ls *ls)
 {
 	struct dlm_recover *rv, *rv_old;
-	struct dlm_config_node *nodes;
+	struct dlm_config_node *nodes = NULL;
 	int error, count;
 
 	rv = kzalloc(sizeof(*rv), GFP_NOFS);