ext4: fix an endianness bug in ext4_encrypted_follow_link()

commit 5a1c7f47 upstream.

applying le32_to_cpu() to 16bit value is a bad idea...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>