Revert commit 31091 - "[target/xburst] remove set but unused variable which leads into compiling errors with GCC >= 4.6.0"

'set-but-unused-variable'-issues are dealt with in a generic way now

SVN-Revision: 31124

target/linux/xburst/patches-2.6.37/600-remove-set-but-unused-var.patch

@@ -1,13 +0,0 @@
---- linux-2.6.37.6.orig/arch/mips/jz4740/dma.c	2011-03-27 21:01:41.000000000 +0200
-+++ linux-2.6.37.6/arch/mips/jz4740/dma.c	2012-03-27 18:29:41.547939867 +0200
-@@ -242,10 +242,6 @@
- 
- static void jz4740_dma_chan_irq(struct jz4740_dma_chan *dma)
- {
--	uint32_t status;
--
--	status = jz4740_dma_read(JZ_REG_DMA_STATUS_CTRL(dma->id));
--
- 	jz4740_dma_write_mask(JZ_REG_DMA_STATUS_CTRL(dma->id), 0,
- 		JZ_DMA_STATUS_CTRL_ENABLE | JZ_DMA_STATUS_CTRL_TRANSFER_DONE);
-