qemu-ga: Fix unchecked strdup() by converting to g_strdup()

I figure it's freed somewhere deep down in QAPI, with g_free().
Signed-off-by: NMarkus Armbruster <armbru@redhat.com>
Reviewed-by: NEric Blake <eblake@redhat.com>
Reviewed-by: NLuiz Capitulino <lcapitulino@redhat.com>
Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>

qga/commands.c

@@ -61,7 +61,7 @@ struct GuestAgentInfo *qmp_guest_info(Error **err)
 
     while (*cmd_list) {
         cmd_info = g_malloc0(sizeof(GuestAgentCommandInfo));
-        cmd_info->name = strdup(*cmd_list);
+        cmd_info->name = g_strdup(*cmd_list);
         cmd_info->enabled = qmp_command_is_enabled(cmd_info->name);
 
         cmd_info_list = g_malloc0(sizeof(GuestAgentCommandInfoList));