egl/surfaceless: Fix EGL_DEVICE_EXT implementation

The native_display checks are incorrect and partially never
executed due to native_display always being NULL.

Fixes: 1efaa858890 ("egl: Fix attrib_list[0] == EGL_NONE check")
Signed-off-by: Robert Foss <rfoss@kernel.org>
Reviewed-by: Adam Jackson <ajax@redhat.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/26131>
1 file changed