[PATCH] ppc32: Fix use of uninitialized pointer in offb

The recent ppc64 changes for offb introduced an uninitialized pointer
use for ppc32, here's the fix:
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/video/offb.c

@@ -246,7 +246,7 @@ static int offb_blank(int blank, struct fb_info *info)
 
 int __init offb_init(void)
 {
-	struct device_node *dp, *boot_disp = NULL;
+	struct device_node *dp = NULL, *boot_disp = NULL;
 #if defined(CONFIG_BOOTX_TEXT) && defined(CONFIG_PPC32)
 	struct device_node *macos_display = NULL;
 #endif