apps/nshlib: fix warning by tools converity report
uninit_use_in_call inaddr.sin_zero before call
netlib_set_arpmapping
@@ -1028,6 +1028,7 @@ int cmd_arp(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
* arp -s <ipaddr> <hwaddr>
*/
+ memset(&inaddr, 0, sizeof(inaddr));
#ifdef CONFIG_NETLINK_ROUTE
if (strcmp(argv[1], "-t") == 0)
{
