ovl: mark ovl_setup_cred_for_create() as unused temporarily

The function will become unused in the next patch.
We'll remove it in later patches to keep the diff legible.

Link: https://patch.msgid.link/20251117-work-ovl-cred-guard-prepare-v2-4-bd1c97a36d7b@kernel.org
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>

Author: brauner

fs/overlayfs/dir.c

@@ -617,7 +617,7 @@ DEFINE_CLASS(ovl_override_creator_creds,
 	     ovl_override_creator_creds(dentry, inode, mode),
 	     struct dentry *dentry, struct inode *inode, umode_t mode)
 
-static const struct cred *ovl_setup_cred_for_create(struct dentry *dentry,
+static const __maybe_unused struct cred *ovl_setup_cred_for_create(struct dentry *dentry,
 						    struct inode *inode,
 						    umode_t mode,
 						    const struct cred *old_cred)