test/crypto: fix mbuf reset after null check

[ upstream commit 2b81eb2 ]

Use m only after it was checked not to be NULL.

Fixes: 202d375 ("app/test: add cryptodev unit and performance tests")

Signed-off-by: Thierry Herbelot <thierry.herbelot@6wind.com>
Acked-by: Akhil Goyal <gakhil@marvell.com>

app/test/test_cryptodev.c

@@ -112,10 +112,11 @@ setup_test_string(struct rte_mempool *mpool,
 	struct rte_mbuf *m = rte_pktmbuf_alloc(mpool);
 	size_t t_len = len - (blocksize ? (len % blocksize) : 0);
 
-	memset(m->buf_addr, 0, m->buf_len);
 	if (m) {
-		char *dst = rte_pktmbuf_append(m, t_len);
+		char *dst;
 
+		memset(m->buf_addr, 0, m->buf_len);
+		dst = rte_pktmbuf_append(m, t_len);
 		if (!dst) {
 			rte_pktmbuf_free(m);
 			return NULL;