Frameworks/base: Wall Werror in libs/storage

Turn on -Wall -Werror in libs/storage.

Change-Id: I314cb32d0a917f9261488f7709d9a78a07b10fea
diff --git a/libs/storage/IMountShutdownObserver.cpp b/libs/storage/IMountShutdownObserver.cpp
index 1a6fdee..a74a768 100644
--- a/libs/storage/IMountShutdownObserver.cpp
+++ b/libs/storage/IMountShutdownObserver.cpp
@@ -33,11 +33,11 @@
             onShutDownComplete(statusCode);
             reply->writeNoException();
             return NO_ERROR;
-        } break;
+        }
         default:
             return BBinder::onTransact(code, data, reply, flags);
     }
 }
 // ----------------------------------------------------------------------
 
-};
+}