app/crypto-perf: fix out-of-place mempool allocation

[ upstream commit c84e324 ]

Add missing rte_mbuf size in mempool allocation for
out-of-place operation.

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

Signed-off-by: Kai Ji <kai.ji@intel.com>
Acked-by: Fan Zhang <roy.fan.zhang@intel.com>
Acked-by: Pablo de Lara <pablo.de.lara.guarch@intel.com>

app/test-crypto-perf/cperf_test_common.c

@@ -194,7 +194,7 @@ cperf_alloc_common_memory(const struct cperf_options *options,
 				(mbuf_size * segments_nb);
 		params.dst_buf_offset = *dst_buf_offset;
 		/* Destination buffer will be one segment only */
-		obj_size += max_size;
+		obj_size += max_size + sizeof(struct rte_mbuf);
 	}
 
 	*pool = rte_mempool_create_empty(pool_name,