wifi: iwlwifi: mvm: Use IWL_FW_CHECK() for BAR notif size validation

wifi: iwlwifi: mvm: Use IWL_FW_CHECK() for BAR notif size validation

Use IWL_FW_CHECK() for BAR notification size validation, improving
diagnostics with a clear error message on failure.

Signed-off-by: Daniel Gabay <daniel.gabay@intel.com>
Reviewed-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Link: https://patch.msgid.link/20241226174257.913d5d476929.I8cd62f45bacc088c309b0152fc392dc2579e82e0@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>