wifi: iwlwifi: mvm: leave a print in the logs when we call fw_nmi()

When we crash the firmware, we need to know why we decided to do so.
Almost all the callsites of iwl_force_nmi() print something in the logs
that explain why the driver decided to crash the firmware.
Debugfs doesn't print anything and it is then hard to understand why the
firmware has crashed.
Add a simple print in the debugfs hook to ease the debug.
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Link: https://msgid.link/20240512075822.e2558de222dc.Idd81777c47264e6f557b086625895c1dc2f667f3@changeidSigned-off-by: Johannes Berg <johannes.berg@intel.com>

drivers/net/wireless/intel/iwlwifi/mvm/debugfs.c

@@ -1396,6 +1396,8 @@ static ssize_t iwl_dbgfs_fw_nmi_write(struct iwl_mvm *mvm, char *buf,
 	if (!iwl_mvm_firmware_running(mvm))
 		return -EIO;
 
+	IWL_ERR(mvm, "Triggering an NMI from debugfs\n");
+
 	if (count == 6 && !strcmp(buf, "nolog\n"))
 		set_bit(IWL_MVM_STATUS_SUPPRESS_ERROR_LOG_ONCE, &mvm->status);