iwmc3200wifi: Dont set the UMAC power limit when interface is down

When we're down, we shouldnt try to set the UMAC power limit. We just return 0
instead, and cfg80211 toggles the soft rfkill state.

Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Signed-off-by: Zhu Yi <yi.zhu@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/iwmc3200wifi/cfg80211.c

@@ -678,13 +678,17 @@ static int iwm_cfg80211_set_txpower(struct wiphy *wiphy,
 	case TX_POWER_AUTOMATIC:
 		return 0;
 	case TX_POWER_FIXED:
+		if (!test_bit(IWM_STATUS_READY, &iwm->status))
+			return 0;
+
 		ret = iwm_umac_set_config_fix(iwm, UMAC_PARAM_TBL_CFG_FIX,
 					      CFG_TX_PWR_LIMIT_USR, dbm * 2);
 		if (ret < 0)
 			return ret;
 
 		return iwm_tx_power_trigger(iwm);
 	default:
+		IWM_ERR(iwm, "Unsupported power type: %d\n", type);
 		return -EOPNOTSUPP;
 	}