[directfb] Fix memory leak when passing arguments to directFB

We need to delete the array but also the elements inside it.

Change-Id: Ib61beeca569802638b9ff3b94ede79c0beebb399
Reviewed-by: Jørgen Lind <jorgen.lind@nokia.com>

src/plugins/platforms/directfb/qdirectfbintegration.cpp

@@ -101,6 +101,9 @@ QDirectFbIntegration::QDirectFbIntegration()
         DirectFBError("QDirectFBScreen: error initializing DirectFB",
                       result);
     }
+
+    for (int i = 0; i < argc; ++i)
+        delete[] argv[i];
     delete[] argv;