iwlwifi: mvm: fail temp test enabling if the ucode is not loaded

If the ucode is not loaded, don't allow the temperature test to be
started, but allow it to be changed or stopped if already running.

Signed-off-by: Luciano Coelho <luciano.coelho@intel.com>
Reviewed-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>

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

@@ -288,6 +288,9 @@ static ssize_t iwl_dbgfs_set_nic_temperature_write(struct iwl_mvm *mvm,
 {
 	int temperature;
 
+	if (!mvm->ucode_loaded && !mvm->temperature_test)
+		return -EIO;
+
 	if (kstrtoint(buf, 10, &temperature))
 		return -EINVAL;
 	/* not a legal temperature */