iwlwifi: make sure runtime calibration is enabled after association

Clear the "start calib" flag only for new association,
The flag will be set in post_associate function to trigger
the runtime calibration. Set this flag to "0" will stop the
runtime sensitivity calibration

Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>

drivers/net/wireless/iwlwifi/iwl-agn.c

@@ -226,9 +226,8 @@ int iwl_commit_rxon(struct iwl_priv *priv, struct iwl_rxon_context *ctx)
 			return ret;
 		}
 	}
-
-	priv->start_calib = 0;
 	if (new_assoc) {
+		priv->start_calib = 0;
 		/* Apply the new configuration
 		 * RXON assoc doesn't clear the station table in uCode,
 		 */