Record client subs correctly.

src/subs.c

@@ -287,9 +287,9 @@ static int _sub_add(struct mosquitto_db *db, struct mosquitto *context, int qos,
 				for(i=0; i<context->sub_count; i++){
 					if(!context->subs[i]){
 						context->subs[i] = subhier;
-					}
 						break;
 					}
+				}
 				if(i == context->sub_count){
 					context->sub_count++;
 					subs = _mosquitto_realloc(context->subs, sizeof(struct _mosquitto_subhier *)*context->sub_count);