net: net_check_clients() runs too early to see -device, fix

Call it right after -device devices get created.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
diff --git a/vl.c b/vl.c
index 98918ac..084604f 100644
--- a/vl.c
+++ b/vl.c
@@ -5897,6 +5897,8 @@
     if (qemu_opts_foreach(&qemu_device_opts, device_init_func, NULL, 1) != 0)
         exit(1);
 
+    net_check_clients();
+
     if (!display_state)
         dumb_display_init();
     /* just use the first displaystate for the moment */