native/gpu: Handle drmModeSetCrtc() failing gracefully
If drmModeSetCrtc() is called with no fb, mode or connectors for some CRTC it may still fail, and we should handle that gracefully instead of assuming it failed to set a non-disabled state.
If drmModeSetCrtc() is called with no fb, mode or connectors for some CRTC it may still fail, and we should handle that gracefully instead of assuming it failed to set a non-disabled state.