dmaengine: sh: Fix unused initialization of pointer lmdesc

Pointer lmdesc is being inintialized with a value that is never read,
it is later being re-assigned a new value. Fix this by initializing
it with the latter value.

Addresses-Coverity: ("Unused value")
Fixes: 550c591 ("dmaengine: sh: Add DMAC driver for RZ/G2L SoC")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Link: https://lore.kernel.org/r/20210829152811.529766-1-colin.king@canonical.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

Author: Colin Ian King

drivers/dma/sh/rz-dmac.c

@@ -308,12 +308,10 @@ static void rz_dmac_prepare_desc_for_memcpy(struct rz_dmac_chan *channel)
 {
 	struct dma_chan *chan = &channel->vc.chan;
 	struct rz_dmac *dmac = to_rz_dmac(chan->device);
-	struct rz_lmdesc *lmdesc = channel->lmdesc.base;
+	struct rz_lmdesc *lmdesc = channel->lmdesc.tail;
 	struct rz_dmac_desc *d = channel->desc;
 	u32 chcfg = CHCFG_MEM_COPY;
 
-	lmdesc = channel->lmdesc.tail;
-
 	/* prepare descriptor */
 	lmdesc->sa = d->src;
 	lmdesc->da = d->dest;