net: Fix '-net nic,model=' for non-help arguments

Oops, don't *delete* the model option when checking for 'help'.

Fixes: 64f75f57f9d2 ("net: Reinstate '-net nic, model=help' output as documented in man page")
Reported-by: Hans <sungdgdhtryrt@gmail.com>
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Cc: qemu-stable@nongnu.org
Reviewed-by: Michael Tokarev <mjt@tls.msk.ru>
Signed-off-by: Jason Wang <jasowang@redhat.com>
1 file changed