linux-gen: dpdk: fix char array size in dpdk_pktio_init()

Reserve space for an extra character in mem_str[] so that sprintf()
can print the null character there, even though we don't actually need
it. Buffer overrun reported by GCC address sanitizer.

Signed-off-by: Jere Leppänen <jere.leppanen@nokia.com>
Reviewed-by: Janne Peltonen <janne.peltonen@nokia.com>
Reviewed-by: Matias Elo <matias.elo@nokia.com>

platform/linux-generic/pktio/dpdk.c

@@ -1435,7 +1435,7 @@ static int dpdk_pktio_init(void)
 	if (numa_nodes <= 0)
 		numa_nodes = 1;
 
-	char mem_str[mem_str_len * numa_nodes];
+	char mem_str[mem_str_len * numa_nodes + 1];
 
 	for (i = 0; i < numa_nodes; i++)
 		sprintf(&mem_str[i * mem_str_len], "%d,", DPDK_MEMORY_MB);