dma-direct: consolidate the error handling in dma_direct_alloc_pages

Use a goto label to merge two error return cases.

Signed-off-by: Christoph Hellwig <[e-mail]>
Reviewed-by: Robin Murphy <[e-mail]>

kernel/dma/direct.c

···
 		ret = dma_common_contiguous_remap(page, PAGE_ALIGN(size),
 				dma_pgprot(dev, PAGE_KERNEL, attrs),
 				__builtin_return_address(0));
-		if (!ret) {
-			dma_free_contiguous(dev, page, size);
-			return ret;
-		}
-
+		if (!ret)
+			goto out_free_pages;
 		memset(ret, 0, size);
 		goto done;
 	}
···
 		 * so log an error and fail.
 		 */
 		dev_info(dev, "Rejecting highmem page from CMA.\n");
-		dma_free_contiguous(dev, page, size);
-		return NULL;
+		goto out_free_pages;
 	}
 
 	ret = page_address(page);
···
 	else
 		*dma_handle = phys_to_dma(dev, page_to_phys(page));
 	return ret;
+out_free_pages:
+	dma_free_contiguous(dev, page, size);
+	return NULL;
 }
 
 void dma_direct_free_pages(struct device *dev, size_t size, void *cpu_addr,