net: Use id_generate() in the network subsystem, too

We already got a global function called id_generate() to create unique
IDs within QEMU. Let's use it in the network subsytem, too, instead of
inventing our own ID scheme here.

Signed-off-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20210215090225.1046239-1-thuth@redhat.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>

util/id.c

@@ -35,6 +35,7 @@ static const char *const id_subsys_str[ID_MAX] = {
     [ID_QDEV]  = "qdev",
     [ID_BLOCK] = "block",
     [ID_CHR] = "chr",
+    [ID_NET] = "net",
 };
 
 /*