Fix memory leak in case of error in wxOSX graphics code.

Delete the pointer before returning from the function if we don't pass its
ownership to CGDataProviderCreateWithData().

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@75955 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/osx/carbon/graphics.cpp

@@ -2977,7 +2977,10 @@ CGDataProviderRef wxMacCGDataProviderCreateWithMemoryBuffer( const wxMemoryBuffe
 {
     wxMemoryBuffer* b = new wxMemoryBuffer( buf );
     if ( b->GetDataLen() == 0 )
+    {
+        delete b;
         return NULL;
+    }
 
     return CGDataProviderCreateWithData( b , (const void *) b->GetData() , b->GetDataLen() ,
                                                  wxMacReleaseMemoryBufferProviderCallback );