[POWERPC] bootwrapper: Modify *pp, not *p, in ft_shuffle().

Move the caller's pointer back to match the change in the region's start,
rather than alter a byte of the device tree's content.

Signed-off-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
diff --git a/arch/powerpc/boot/flatdevtree.c b/arch/powerpc/boot/flatdevtree.c
index 0fa4f98..f2a29ca 100644
--- a/arch/powerpc/boot/flatdevtree.c
+++ b/arch/powerpc/boot/flatdevtree.c
@@ -246,7 +246,7 @@
 			if (rgn == FT_STRUCT)
 				ft_node_update_before(cxt, p, -nextra);
 		}
-		*p -= nextra;
+		*pp -= nextra;
 		cxt->rgn[rgn].start -= nextra;
 		cxt->rgn[rgn].size += nextra;
 		return 1;