Crash when inspecting background 2 in "View map..."

[justburner]

mGBA silently crash when inspecting background 2 while in Mode 5

Reproduction steps

1. Load entaktogen 3D test ROM
2. Tools > View map...
3. Click "Background 2" radiobox
4. mGBA instantly closes

[endrift]

Weirdly it's not crashing for me, but it's definitely very glitchy.

[justburner]

Thanks, that patch fixed it, it no longer crashes here.

Forgot to mention that i'm using Windows 7

[endrift]

Yeah, address sanitizer very quickly found why it was crashing.