fs: dlm: constify addr_compare

This patch just constify some function parameter which should be have a
read access only.
Signed-off-by: NAlexander Aring <aahringo@redhat.com>
Signed-off-by: NDavid Teigland <teigland@redhat.com>

fs/dlm/lowcomms.c

@@ -274,7 +274,8 @@ static struct dlm_node_addr *find_node_addr(int nodeid)
 	return NULL;
 }
 
-static int addr_compare(struct sockaddr_storage *x, struct sockaddr_storage *y)
+static int addr_compare(const struct sockaddr_storage *x,
+			const struct sockaddr_storage *y)
 {
 	switch (x->ss_family) {
 	case AF_INET: {