autofs - constify misc struct path instances

Signed-off-by: Ian Kent <raven@themaw.net>
Cc: Al Viro <viro@ZenIV.linux.org.uk>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: Omar Sandoval <osandov@osandov.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/autofs4/expire.c b/fs/autofs4/expire.c
index 9c352da..13178bf 100644
--- a/fs/autofs4/expire.c
+++ b/fs/autofs4/expire.c
@@ -593,7 +593,7 @@ int autofs4_do_expire_multi(struct super_block *sb, struct vfsmount *mnt,
 
 	if (dentry) {
 		struct autofs_info *ino = autofs4_dentry_ino(dentry);
-		struct path path = { .mnt = mnt, .dentry = dentry };
+		const struct path path = { .mnt = mnt, .dentry = dentry };
 
 		/* This is synchronous because it makes the daemon a
 		 * little easier