fix many unclosed file opened by open_image_ro

Many image files opened by open_image_ro weren't closed before return, fix
them all in this patch.

Signed-off-by: Huang Qiang <h.huangqiang@huawei.com>
Acked-by: Andrew Vagin <avagin@parallels.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

net.c

@@ -265,6 +265,7 @@ static int restore_links(int pid)
 	nlsk = socket(PF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
 	if (nlsk < 0) {
 		pr_perror("Can't create nlk socket");
+		close_safe(&fd);
 		return -1;
 	}