r8169: disable interrupt source RxOverflow

Vendor driver calls this bit RxDescUnavail. All we do in the interrupt
handler in this case is scheduling NAPI. If we should be out of
RX descriptors, then NAPI is scheduled anyway. Therefore remove this
interrupt source. Tested on RTL8168h.
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Reviewed-by: Sunil Goutham <sgoutham@marvell.com>
Link: https://lore.kernel.org/r/9b2054b2-0548-4f48-bf91-b646572093b4@gmail.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/realtek/r8169_main.c

@@ -5086,12 +5086,10 @@ static void rtl_set_irq_mask(struct rtl8169_private *tp)
 	tp->irq_mask = RxOK | RxErr | TxOK | TxErr | LinkChg;
 
 	if (tp->mac_version <= RTL_GIGA_MAC_VER_06)
-		tp->irq_mask |= SYSErr | RxOverflow | RxFIFOOver;
+		tp->irq_mask |= SYSErr | RxFIFOOver;
 	else if (tp->mac_version == RTL_GIGA_MAC_VER_11)
 		/* special workaround needed */
 		tp->irq_mask |= RxFIFOOver;
-	else
-		tp->irq_mask |= RxOverflow;
 }
 
 static int rtl_alloc_irq(struct rtl8169_private *tp)