[POWERPC] Fix a printk in pseries_mpic_init_IRQ

This should probably say "mpic" to save confusion.
Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/platforms/pseries/setup.c

@@ -180,7 +180,7 @@ static void __init pseries_mpic_init_IRQ(void)
 
 	cascade_irq = irq_of_parse_and_map(cascade, 0);
 	if (cascade == NO_IRQ) {
-		printk(KERN_ERR "xics: failed to map cascade interrupt");
+		printk(KERN_ERR "mpic: failed to map cascade interrupt");
 		return;
 	}