Fix memory leak warning.

This CL eliminates the following compiler warning:

MediaPlayerFactory.cpp:249:27: warning: Potential memory leak

Bug: None
Test: After this change the warning is gone.
Change-Id: I09e7ec5cc3bc84decfea2456550b532aac55d26f
diff --git a/media/libmediaplayerservice/MediaPlayerFactory.cpp b/media/libmediaplayerservice/MediaPlayerFactory.cpp
index 605c710..f7c691d 100644
--- a/media/libmediaplayerservice/MediaPlayerFactory.cpp
+++ b/media/libmediaplayerservice/MediaPlayerFactory.cpp
@@ -246,8 +246,12 @@
     if (sInitComplete)
         return;
 
-    registerFactory_l(new NuPlayerFactory(), NU_PLAYER);
-    registerFactory_l(new TestPlayerFactory(), TEST_PLAYER);
+    IFactory* factory = new NuPlayerFactory();
+    if (registerFactory_l(factory, NU_PLAYER) != OK)
+        delete factory;
+    factory = new TestPlayerFactory();
+    if (registerFactory_l(factory, TEST_PLAYER) != OK)
+        delete factory;
 
     sInitComplete = true;
 }