dispatcher: test len for matching all token in setting the state via rpc

src/modules/dispatcher/dispatcher.c

@@ -1360,7 +1360,7 @@ static void dispatcher_rpc_set_state(rpc_t *rpc, void *ctx)
 		return;
 	}
 
-	if(strcmp(dest.s, "all") == 0) {
+	if(dest.len == 3 && strncmp(dest.s, "all", 3) == 0) {
 		ds_reinit_state_all(group, stval);
 	} else {
 		if(ds_reinit_state(group, &dest, stval) < 0) {