crypto: stm32 - use of_device_get_match_data

The usage of of_device_get_match_data reduce the code size a bit.
Furthermore, it prevents an improbable dereference when
of_match_device() return NULL.
Signed-off-by: Corentin Labbe <clabbe.montjoie@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/stm32/stm32-hash.c

@@ -1407,11 +1407,10 @@ MODULE_DEVICE_TABLE(of, stm32_hash_of_match);
 static int stm32_hash_get_of_match(struct stm32_hash_dev *hdev,
 				   struct device *dev)
 {
-	const struct of_device_id *match;
 	int err;
 
-	match = of_match_device(stm32_hash_of_match, dev);
-	if (!match) {
+	hdev->pdata = of_device_get_match_data(dev);
+	if (!hdev->pdata) {
 		dev_err(dev, "no compatible OF match\n");
 		return -EINVAL;
 	}
@@ -1419,8 +1418,6 @@ static int stm32_hash_get_of_match(struct stm32_hash_dev *hdev,
 	err = of_property_read_u32(dev->of_node, "dma-maxburst",
 				   &hdev->dma_maxburst);
 
-	hdev->pdata = match->data;
-
 	return err;
 }