staging: vt6655: reset tsf on dissociation

Ensuring that tsf counter does not run while idle.
Signed-off-by: Malcolm Priestley <tvboxspy@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/vt6655/device_main.c

@@ -2980,6 +2980,11 @@ static void vnt_bss_info_changed(struct ieee80211_hw *hw,
 
 			CARDvSetFirstNextTBTT(priv->PortOffset,
 					      conf->beacon_int);
+		} else {
+			VNSvOutPortB(priv->PortOffset + MAC_REG_TFTCTL,
+				     TFTCTL_TSFCNTRST);
+			VNSvOutPortB(priv->PortOffset + MAC_REG_TFTCTL,
+				     TFTCTL_TSFCNTREN);
 		}
 	}
 }