ARM: vfp: only clear vfp state for current cpu in vfp_pm_suspend

vfp_pm_suspend runs on each cpu, only clear the hardware state
pointer for the current cpu.  Prevents a possible crash if one
cpu clears the hw state pointer when another cpu has already
checked if it is valid.

arch/arm/vfp/vfpmodule.c

@@ -451,7 +451,7 @@ static int vfp_pm_suspend(struct sys_device *dev, pm_message_t state)
 	}
 
 	/* clear any information we had about last context state */
-	memset(last_VFP_context, 0, sizeof(last_VFP_context));
+	last_VFP_context[ti->cpu] = NULL;
 
 	return 0;
 }