Don't crash when eglCreateContext fails

eglCreateContext fails with every EGLConfig that
nvidia blob 334.16 provides causing NULL pointer
dereference in gl_renderer_destroy when destroying
fragment and fan bindings.

https://bugs.freedesktop.org/show_bug.cgi?id=74699

Signed-off-by: Mariusz Ceier <mceier+wayland@gmail.com>
1 file changed