When MEI isn't built, it seems like successfully registering would be wrong. Change this to an error so that in the rest of the driver, mei_registered won't be true. Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: Gregory Greenman <gregory.greenman@intel.com> Link: https://lore.kernel.org/r/20231004123422.d410a97cddfb.I7891544938d5edd5e6e7d2d99540b3637f2f1b1b@changeid Signed-off-by: Johannes Berg <johannes.berg@intel.com>