add --only-create-db option from msells

have SIGHUP cause rereading db file

git-svn-id: https://svn.musicpd.org/mpd/trunk@663 09075e82-0dd4-0310-85a5-a0d7c8717e4f

src/list.c

@@ -88,6 +88,9 @@ int insertInListBeforeNode(List * list, ListNode * beforeNode, char * key,
 	}
 	else {
 		node->prevNode = beforeNode->prevNode;
+		if(node->prevNode) {
+			node->prevNode->nextNode = node;
+		}
 		beforeNode->prevNode = node;
 	}