dmaengine: ioat: remove unused ‘is_raid_device’

In ioat3_dma_probe(), variable ‘is_raid_device’ is initialized but never
used, which leads to warning with W=1

drivers/dma/ioat/init.c: In function ‘ioat3_dma_probe’:
drivers/dma/ioat/init.c:1084:7: warning: variable ‘is_raid_device’ set
but not used [-Wunused-but-set-variable]
bool is_raid_device = false;

So remove it.

Cc: Dave Jiang <[e-mail]>
Signed-off-by: Vinod Koul <[e-mail]>

drivers/dma/ioat/init.c

···
 	struct dma_device *dma;
 	struct dma_chan *c;
 	struct ioatdma_chan *ioat_chan;
-	bool is_raid_device = false;
 	int err;
 	u16 val16;
 
···
 		ioat_dma->cap &= ~(IOAT_CAP_XOR|IOAT_CAP_PQ);
 
 	if (ioat_dma->cap & IOAT_CAP_XOR) {
-		is_raid_device = true;
 		dma->max_xor = 8;
 
 		dma_cap_set(DMA_XOR, dma->cap_mask);
···
 	}
 
 	if (ioat_dma->cap & IOAT_CAP_PQ) {
-		is_raid_device = true;
 
 		dma->device_prep_dma_pq = ioat_prep_pq;
 		dma->device_prep_dma_pq_val = ioat_prep_pq_val;