Bugfix for pbkdf2 unsplit OpenCL kernel. Bug may have affected several
formats where salt length was larger than 23. Thanks to Marcus Desto for
reporting.
Merge branch 'bleeding-jumbo' into memdbg

* bleeding-jumbo:
  Bugfix for pbkdf2 unsplit OpenCL kernel. Bug may have affected several formats where salt length was larger than 23. Thanks to Marcus Desto for reporting.