wifi: iwlwifi: fw: use correct IML/ROM status register

Different registers should be used, but they code wasn't
adjusted for the 'error' register, only for the 'data1'.
Fix that.

Coverity CID: 1487176
Coverity CID: 1487230

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
Link: https://lore.kernel.org/r/20221205102808.28de1a5b2493.I356c9404623fd5ef793d47481fe37a95be355c6b@changeid