linux-wandboard

OMAP: DSS2: DSI: fix IRQ debug prints

print_irq_status functions can be called with empty irq status when full
irq debugging is enabled. This patch makes print_irq_status functions
return immediately when given an empty irq status to lessen the debug
spam slightly.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>