config: remove HAVE_TMPFILE

Sponsored-by: https://despairlabs.com/sponsor/
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Reviewed-by: Tino Reichardt <milky-zfs@mcmilk.de>
Signed-off-by: Rob Norris <robn@despairlabs.com>
Closes #16479

module/os/linux/zfs/zfs_vnops_os.c

@@ -3442,9 +3442,9 @@ zfs_link(znode_t *tdzp, znode_t *szp, char *name, cred_t *cr,
 	boolean_t	waited = B_FALSE;
 	boolean_t	is_tmpfile = 0;
 	uint64_t	txg;
-#ifdef HAVE_TMPFILE
+
 	is_tmpfile = (sip->i_nlink == 0 && (sip->i_state & I_LINKABLE));
-#endif
+
 	ASSERT(S_ISDIR(ZTOI(tdzp)->i_mode));
 
 	if (name == NULL)

module/os/linux/zfs/zpl_inode.c

@@ -238,7 +238,6 @@ zpl_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
 	return (error);
 }
 
-#ifdef HAVE_TMPFILE
 static int
 #ifdef HAVE_TMPFILE_IDMAP
 zpl_tmpfile(struct mnt_idmap *userns, struct inode *dir,
@@ -307,7 +306,6 @@ zpl_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
 
 	return (error);
 }
-#endif
 
 static int
 zpl_unlink(struct inode *dir, struct dentry *dentry)
@@ -763,9 +761,7 @@ const struct inode_operations zpl_dir_inode_operations = {
 #else
 	.rename		= zpl_rename,
 #endif
-#ifdef HAVE_TMPFILE
 	.tmpfile	= zpl_tmpfile,
-#endif
 	.setattr	= zpl_setattr,
 	.getattr	= zpl_getattr,
 	.listxattr	= zpl_xattr_list,