app/test-crypto-perf: fix invalid mbuf next operation

In fill_multi_seg_mbuf(), when remaining_segments is 0,
rte_mbuf m's next should pointer to NULL instead of a
new rte_mbuf, that casues setting m->next as NULL out
of the while loop to the invalid mbuf.

This commit fixes the invalid mbuf next operation.

Fixes: bf9d670 ("app/crypto-perf: use single mempool")

Signed-off-by: Suanming Mou <suanmingm@nvidia.com>
Signed-off-by: 0-day Robot <robot@bytheb.org>

app/test-crypto-perf/cperf_test_common.c

@@ -72,13 +72,15 @@ fill_multi_seg_mbuf(struct rte_mbuf *m, struct rte_mempool *mp,
 		rte_mbuf_refcnt_set(m, 1);
 		next_mbuf = (struct rte_mbuf *) ((uint8_t *) m +
 					mbuf_hdr_size + segment_sz);
-		m->next = next_mbuf;
-		m = next_mbuf;
-		remaining_segments--;
 
+		remaining_segments--;
+		if (remaining_segments > 0) {
+			m->next = next_mbuf;
+			m = next_mbuf;
+		} else {
+			m->next = NULL;
+		}
 	} while (remaining_segments > 0);
-
-	m->next = NULL;
 }
 
 static void