[4/6] windowscodecs: Implement IPropertyBag2::GetPropertyInfo

[Vincent Povirk]

+            if (This->properties[i].pstrName)
+            {
+                HeapFree(GetProcessHeap(), 0, This->properties[i].pstrName);
+            }

HeapFree already checks for NULL, so there's no need for an if statement here.