hfs{plus}: add deprecation warning

Both the hfs and hfsplus filesystem have been orphaned since at least
2014, i.e., over 10 years. It's time to remove them from the kernel as
they're exhibiting more and more issues and no one is stepping up to
fixing them.

Signed-off-by: Christian Brauner <[e-mail]>

fs/hfs/super.c

···
 {
 	struct hfs_sb_info *hsb;
 
+	pr_warn("The hfs filesystem is deprecated and scheduled to be removed from the kernel in 2025\n");
+
 	hsb = kzalloc(sizeof(struct hfs_sb_info), GFP_KERNEL);
 	if (!hsb)
 		return -ENOMEM;

fs/hfsplus/super.c

···
 {
 	struct hfsplus_sb_info *sbi;
 
+	pr_warn("The hfsplus filesystem is deprecated and scheduled to be removed from the kernel in 2025\n");
+
 	sbi = kzalloc(sizeof(struct hfsplus_sb_info), GFP_KERNEL);
 	if (!sbi)
 		return -ENOMEM;