mwl8k: Do not call mwl8k_cmd_set_rf_channel unconditionally

Avoid calling mwl8k_cmd_set_rf_channel unconditionally
by checking IEEE80211_CONF_CHANGE_CHANNEL.
Signed-off-by: Yogesh Ashok Powar <yogeshp@marvell.com>
Signed-off-by: Nishant Sarmukadam <nishants@marvell.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/mwl8k.c

@@ -4797,9 +4797,11 @@ static int mwl8k_config(struct ieee80211_hw *hw, u32 changed)
 	if (rc)
 		goto out;
 
+	if (changed & IEEE80211_CONF_CHANGE_CHANNEL) {
 		rc = mwl8k_cmd_set_rf_channel(hw, conf);
 		if (rc)
 			goto out;
+	}
 
 	if (conf->power_level > 18)
 		conf->power_level = 18;