app/regex: fix mbuf size for multi-segment buffer

When allocating multi segmented buffers, and in case there is
a remainder in total buf len, the actual job len might be more
than expected job_len.

This adds additional space in the mbuf in the multi seg case,
to allow the remaining memory to be stored in one segment.

Fixes: c1d1b94eec58 ("app/regex: fix number of matches")
Cc: stable@dpdk.org

Signed-off-by: Raslan Darawsheh <rasland@nvidia.com>
Acked-by: Ori Kam <orika@nvidia.com>

app/test-regex/main.c

@@ -412,8 +412,8 @@ run_regex(void *args)
 	mbuf_mp = rte_pktmbuf_pool_create(mbuf_pool,
 			rte_align32pow2(nb_jobs * nb_qps * nb_segs),
 			0, 0, (nb_segs == 1) ? MBUF_SIZE :
-			(rte_align32pow2(job_len) / nb_segs +
-			RTE_PKTMBUF_HEADROOM),
+			(rte_align32pow2(job_len + (data_len % nb_jobs)) /
+			 nb_segs + RTE_PKTMBUF_HEADROOM),
 			rte_socket_id());
 	if (mbuf_mp == NULL) {
 		printf("Error, can't create memory pool\n");