initrd: mark init_linuxrc as __init

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>

init/do_mounts_initrd.c

@@ -56,7 +56,7 @@ static int __init early_initrd(char *p)
 }
 early_param("initrd", early_initrd);
 
-static int init_linuxrc(struct subprocess_info *info, struct cred *new)
+static int __init init_linuxrc(struct subprocess_info *info, struct cred *new)
 {
 	ksys_unshare(CLONE_FS | CLONE_FILES);
 	console_on_rootfs();