Recognize IPv6 addresses for "adb connect".

Bug: http://b/22559299
Change-Id: I32891d706b5010c38db84a056e76dd279b780f75
diff --git a/adb_client.cpp b/adb_client.cpp
index ef9a586..9a1b761 100644
--- a/adb_client.cpp
+++ b/adb_client.cpp
@@ -277,8 +277,7 @@
     D("adb_query: %s\n", service.c_str());
     int fd = adb_connect(service, error);
     if (fd < 0) {
-        fprintf(stderr,"error: %s\n", error->c_str());
-        return 0;
+        return false;
     }
 
     result->clear();