powerpc/traps/e500: fix misleading error output

In machine_check_e500 exception handler is a wrong indication
in case of MCSR_BUS_WBERR - so print "Write" instead of "Read".
Signed-off-by: NWladislav Wiebe <wladislav.kw@gmail.com>
Signed-off-by: NScott Wood <scottwood@freescale.com>

arch/powerpc/kernel/traps.c

@@ -609,7 +609,7 @@ int machine_check_e500(struct pt_regs *regs)
 	if (reason & MCSR_BUS_RBERR)
 		printk("Bus - Read Data Bus Error\n");
 	if (reason & MCSR_BUS_WBERR)
-		printk("Bus - Read Data Bus Error\n");
+		printk("Bus - Write Data Bus Error\n");
 	if (reason & MCSR_BUS_IPERR)
 		printk("Bus - Instruction Parity Error\n");
 	if (reason & MCSR_BUS_RPERR)