[ARM PATCH] 2361/1: clean up irq handling code for IOP33x platforms

Patch from Dave Jiang

Signed-off-by: Dave Jiang

Substitute 2 asm instr w/ one recommend by RMK.
Signed-off-by: Russell King

include/asm-arm/arch-iop3xx/entry-macro.S

@@ -43,16 +43,11 @@
 		cmp	\irqstat, #0
 		beq	1001f
 		clz	\irqnr, \irqstat
-/*
- *		mov	\base, #31
- *		subs	\irqnr,\base,\irqnr
- */
 		rsbs    \irqnr,\irqnr,#31   @ recommend by RMK
 		add	\irqnr,\irqnr,#IRQ_IOP331_XINT8
 		b	1001f
 1002:	clz     \irqnr, \irqstat
-		mov     \base, #31
-		subs    \irqnr,\base,\irqnr
+		rsbs    \irqnr,\irqnr,#31   @ recommend by RMK
 		add     \irqnr,\irqnr,#IRQ_IOP331_DMA0_EOT
 1001:
 		.endm