[POWERPC] spufs: remove stop_code from struct spu

This patch remove 'stop_code' -- discarded member of struct spu.
It is written at initialize and interrupt, but never read
in current implementation.

Signed-off-by: Masato Noguchi <Masato.Noguchi@jp.sony.com>
Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>

include/asm-powerpc/spu.h

@@ -134,7 +134,6 @@ struct spu {
 	int class_0_pending;
 	spinlock_t register_lock;
 
-	u32 stop_code;
 	void (* wbox_callback)(struct spu *spu);
 	void (* ibox_callback)(struct spu *spu);
 	void (* stop_callback)(struct spu *spu);