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>
diff --git a/drivers/net/wireless/iwlwifi/iwl-agn.c b/drivers/net/wireless/iwlwifi/iwl-agn.c
index a19671d..36df9a7 100644
--- a/drivers/net/wireless/iwlwifi/iwl-agn.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn.c
@@ -226,9 +226,8 @@
 			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,
 		 */