client: Add pcap snaplen VTY cmd

Change-Id: I84fda9f27b725e031c218187ab679392dfa7ec3d
diff --git a/src/osmo_client_main.c b/src/osmo_client_main.c
index f571b96..a28c4b7 100644
--- a/src/osmo_client_main.c
+++ b/src/osmo_client_main.c
@@ -212,12 +212,11 @@
 		exit(1);
 	}
 
-	pcap_client = talloc_zero(tall_cli_ctx, struct osmo_pcap_client);
+	pcap_client = osmo_pcap_client_alloc(tall_cli_ctx);
 	if (!pcap_client) {
 		LOGP(DCLIENT, LOGL_ERROR, "Failed to allocate osmo_pcap_client.\n");
 		exit(1);
 	}
-	pcap_client->fd.fd = -1;
 	vty_client_init(pcap_client);
 
 	/* initialize the queue */