ext4: Fix error code in ext4_xattr_set_entry()

ext4_xattr_set_entry should return EFSCORRUPTED instead of EIO
for corrupted xattr entries.

Fixes b469713e ("ext4: add corruption check in ext4_xattr_set_entry()")

Signed-off-by: Daniel Rosenberg <drosen@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>