crypto: mxs-dcp - fix type of ret for wait_for_completion_timeout

return type of wait_for_completion_timeout is unsigned long not int, this
patch changes the type of ret from int to unsigned long.
Signed-off-by: Nicholas Mc Guire <hofrat@osadl.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/mxs-dcp.c

@@ -153,7 +153,7 @@ static int mxs_dcp_start_dma(struct dcp_async_ctx *actx)
 	struct dcp *sdcp = global_sdcp;
 	const int chan = actx->chan;
 	uint32_t stat;
-	int ret;
+	unsigned long ret;
 	struct dcp_dma_desc *desc = &sdcp->coh->desc[actx->chan];
 
 	dma_addr_t desc_phys = dma_map_single(sdcp->dev, desc, sizeof(*desc),