staging: et131x: Fix ET_INTR_TXDMA_ISR register name typo

We actually mean to clear the ET_INTR_TXDMA_ISR reg after handling
a completed transfer, not the ET_INTR_TXDMA_ERR reg, which should
get handled immediately after.
Signed-off-by: Mark Einon <mark.einon@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/et131x/et131x.c

@@ -3903,7 +3903,7 @@ static void et131x_isr_handler(struct work_struct *work)
 	if (status & ET_INTR_RXDMA_XFR_DONE)
 		et131x_handle_recv_interrupt(adapter);
 
-	status &= ~(ET_INTR_TXDMA_ERR | ET_INTR_RXDMA_XFR_DONE);
+	status &= ~(ET_INTR_TXDMA_ISR | ET_INTR_RXDMA_XFR_DONE);
 
 	if (!status)
 		goto out;