egl: Fix crashes in eglCreate*Surface()

Don't dereference a null EGLDisplay.

Fixes tests
  dEQP-EGL.functional.negative_api.create_pbuffer_surface
  dEQP-EGL.functional.negative_api.create_pixmap_surface

Reviewed-by: Mark Janes <mark.a.janes@intel.com>
Reviewed-by: Tapani Pälli <tapani.palli@intel.com>
Fixes: https://bugs.freedesktop.org/show_bug.cgi?id=99038
Cc: "13.0" <mesa-stable@lists.freedesktop.org>
1 file changed