ath9k: Re-enable RXOEL interrupt after processing rx buffers

Once RXEOL was disabled, it never be enabled again. This patch
re-enables rxeol at the end of rx tasklet.

Signed-off-by: Rajkumar Manoharan <rmanohar@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath/ath9k/recv.c

@@ -1978,5 +1978,10 @@ requeue:
 
 	spin_unlock_bh(&sc->rx.rxbuflock);
 
+	if (!(ah->imask & ATH9K_INT_RXEOL)) {
+		ah->imask |= (ATH9K_INT_RXEOL | ATH9K_INT_RXORN);
+		ath9k_hw_set_interrupts(ah, ah->imask);
+	}
+
 	return 0;
 }