ext4: remove incorrect comment for NEXT_ORPHAN()

The comment above NEXT_ORPHAN() was meant for ext4_encrypted_inode(),
which was moved by commit a7550b30 ("ext4 crypto: migrate into vfs's
crypto engine") but the comment was accidentally left in place.  Since
ext4_encrypted_inode() has now been removed, just remove the comment.
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Jan Kara <jack@suse.cz>

fs/ext4/ext4.h

@@ -1592,9 +1592,6 @@ static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
 #define EXT4_SB(sb)	(sb)
 #endif
 
-/*
- * Returns true if the inode is inode is encrypted
- */
 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
 
 /*