Fix bug introduced by the prefix key + multibyte charsets patch today


sql/ha_innodb.cc:
  Fix bug introduced by the prefix key + multibyte charsets patch today
innobase/include/data0type.h:
  Fix bug introduced by the prefix key + multibyte charsets patch today
innobase/include/fsp0fsp.h:
  Fix bug introduced by the prefix key + multibyte charsets patch today
innobase/data/data0type.c:
  Fix bug introduced by the prefix key + multibyte charsets patch today
innobase/row/row0ins.c:
  Fix bug introduced by the prefix key + multibyte charsets patch today
innobase/row/row0row.c:
  Fix bug introduced by the prefix key + multibyte charsets patch today
innobase/row/row0sel.c:
  Fix bug introduced by the prefix key + multibyte charsets patch today
innobase/row/row0upd.c:
  Fix bug introduced by the prefix key + multibyte charsets patch today