omap: McBSP: tx_irq_completion used in rx_irq_handler

Looks like a typo from commit d6d834b0.
Signed-off-by: NScott Ellis <scott@jumpnowtek.com>
Acked-by: NPeter Ujfalusi <peter.ujfalusi@nokia.com>
Signed-off-by: NTony Lindgren <tony@atomide.com>

arch/arm/plat-omap/mcbsp.c

@@ -156,7 +156,7 @@ static irqreturn_t omap_mcbsp_rx_irq_handler(int irq, void *dev_id)
 		/* Writing zero to RSYNC_ERR clears the IRQ */
 		MCBSP_WRITE(mcbsp_rx, SPCR1, MCBSP_READ_CACHE(mcbsp_rx, SPCR1));
 	} else {
-		complete(&mcbsp_rx->tx_irq_completion);
+		complete(&mcbsp_rx->rx_irq_completion);
 	}
 
 	return IRQ_HANDLED;