egl/dri2: Set error code when dri2CreateContextAttribs fails

When dri2CreateContextContextAttribs failed, eglCreateContext returned
NULL yet set the error code to EGL_SUCCESS! The problem was that
eglCreateContext ignored the error code returned by
driCreateContextAttribs.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=56706
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Signed-off-by: Chad Versace <chad.versace@linux.intel.com>
1 file changed