mythfrontend/playbackbox.cpp:updateVideo() never sets conv_rgba_size causes delete/new every frame

[jwestfall <jwestfall@…>]

       if (conv_rgba_size.width() != w || conv_rgba_size.height() != h)
        { 
            if (conv_rgba_buf)
                delete [] conv_rgba_buf;
            conv_rgba_buf = new unsigned char[w * h * 4];
        }

code is setup to only delete/new the rgb buffer if there has been a res change, but conv_rgba_size is never updated. This is forcing the if statement to be true on every frame.

[jwestfall <jwestfall@…>]

fix

[Isaac Richards]

(In [8662]) Patch from Jim to fix #1074.