kvm tools: Check for unknown parameters in network option handling

Currently the parsing of network command line parameters doesn't check
for unknown parameters.

For example "-n mod=none" will cause kvmtool to setup TAP networking.

Save users from their typos by checking for unknown parameters and bailing.

Acked-by: Asias He <asias.hejun@gmail.com>
Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Pekka Enberg <penberg@kernel.org>

builtin-run.c

@@ -257,7 +257,8 @@ static int set_net_param(struct virtio_net_params *p, const char *param,
 		p->vhost = atoi(val);
 	} else if (strcmp(param, "fd") == 0) {
 		p->fd = atoi(val);
-	}
+	} else
+		die("Unknown network parameter %s", param);
 
 	return 0;
 }