Blackfin: dma: bf54x: add missing break for SPORT1 TX IRQ

Reported-by: ND Binderman <dcb314@hotmail.com>
Signed-off-by: NMike Frysinger <vapier@gentoo.org>

arch/blackfin/mach-bf548/dma.c

@@ -63,6 +63,7 @@ int channel2irq(unsigned int channel)
 		break;
 	case CH_SPORT1_TX:
 		ret_irq = IRQ_SPORT1_TX;
+		break;
 	case CH_SPI0:
 		ret_irq = IRQ_SPI0;
 		break;