Maurice van der Stee noted that he got an oops on a HPFS filesystem when
saving an edited file..

  <stares at the code>
  <blinks>
  <wonders whereTF do we assign hpfs1_i and hpfs2_i if both inodes are non-NULL>
  <finds the patch in question>
  <stares at jgarzik>

This fixes it.  That, BTW, means that *nobody* had ever tried to use
hpfs r/w since 2.5.3-pre3.