rtlwifi: rtl8192se: Synchronize IRQ after disabling it

As suggested by Mike McCormack <mikem@ring3k.org> for rtl8192ce, make sure any IRQ
handlers running on other CPUs complete.
Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/rtlwifi/rtl8192se/hw.c

@@ -1226,6 +1226,7 @@ void rtl92se_disable_interrupt(struct ieee80211_hw *hw)
 	rtl_write_dword(rtlpriv, INTA_MASK + 4, 0);
 
 	rtlpci->irq_enabled = false;
+	synchronize_irq(rtlpci->pdev->irq);
 }