Seg fault when glGetString() retrun NULL

[Narann]

There is some situations where glGetString calls, like glGetString(GL_EXTENSIONS);, return a NULL pointer. As this string is parsed to find supported extensions, this bring to a crash:

Video: Using OpenGL: (null) - (null) : (null)
Segmentation fault

Those situations are rare (in my case it's when I link Rice to libGLESv2.so without any hardware support. But should be handled smoothly with an error message.

[Narann]

Fixed in https://github.com/Narann/mupen64plus-video-rice/commit/262858dfb83bfb38aad1cb4ef879ce0137228dc4