net: Improve error message for -net hubport a bit

Type "hubport" is valid only with -netdev.  Unfortunately, that's
detected late and the error message doesn't explain why:

    $ qemu-system-i386 -net hubport,id=foo,hubid=0
    qemu-system-i386: -net hubport,id=foo,hubid=0: Device 'hubport' could not be initialized

Improve the error message to "Parameter 'type' expects a net type".

Not fixed: -net hubport without the parameters required by -netdev
hubport still asks for those parameters:

    $ qemu-system-i386 -net hubport
    qemu-system-i386: -net hubport: Parameter 'hubid' is missing

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-id: 1431691143-1015-2-git-send-email-armbru@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

1 files changed, 1 insertions, 4 deletions

diff --git a/net/hub.c b/net/hub.c
index 2b60ab9a60..261f8ccc3f 100644
--- a/net/hub.c
+++ b/net/hub.c
@@ -286,12 +286,9 @@ int net_init_hubport(const NetClientOptions *opts, const char *name,
     const NetdevHubPortOptions *hubport;
 
     assert(opts->kind == NET_CLIENT_OPTIONS_KIND_HUBPORT);
+    assert(!peer);
     hubport = opts->hubport;
 
-    if (peer) {
-        return -EINVAL;
-    }
-
     net_hub_add_port(hubport->hubid, name);
     return 0;
 }