[PATCH] ppc32: Fix potentially uninitialized var in chrp_setup.c

In chrp_setup.c, chrp_int_ack could be left uninitialized and passed
"as-is" to i8259_init() if the OF node for the 8259 wasn't found.  I
don't know if that should happen, but the i8259 code can deal with
int_ack beeing 0, so let's be safe, initialize it, and remove a warning
at the same time. 
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/ppc/platforms/chrp_setup.c

@@ -375,7 +375,7 @@ void __init chrp_init_IRQ(void)
 {
 	struct device_node *np;
 	int i;
-	unsigned long chrp_int_ack;
+	unsigned long chrp_int_ack = 0;
 	unsigned char init_senses[NR_IRQS - NUM_8259_INTERRUPTS];
 #if defined(CONFIG_VT) && defined(CONFIG_INPUT_ADBHID) && defined(XMON)
 	struct device_node *kbd;