IXP4xx: Fix LE data-coherent mode swapping.

Signed-off-by: Krzysztof Hałasa <khc@pm.waw.pl>
diff --git a/arch/arm/mm/proc-xscale.S b/arch/arm/mm/proc-xscale.S
index afbb09e..cec83ec 100644
--- a/arch/arm/mm/proc-xscale.S
+++ b/arch/arm/mm/proc-xscale.S
@@ -611,7 +611,7 @@
 	mov	pc, r7
 
 __xscale_setup_moved:
-	mov	r6, r4				@ base address to swap
+	mov	r6, #0				@ base address to swap
 	ldr	r7, bss_start			@ end address
 	bl	xscale_swap