#244 Patch for segfualt on closing in linux

[Cameron Kellough]

After selecting a shader, closing the program will cause a segfault on close. I've traced this problem to MultiViewer_Container * GLArea::mvc()

The structure of the lloop causes curParent->parent to dereference a null pointer when curParent is already 0.

I've attached a patch that fixes the bug for me by checking for the null pointer but there may be a better way in a higher level routine.

[Cameron Kellough]

[Cameron Kellough]

The same bug exists in the routine MainWindow * GLArea::mw()

[Cameron Kellough]

The same problem happens in MainWindow * GLArea::mw()