rem0rec.c:
  rec_init_offsets(): Make the function comment more accurate.
rem0rec.ic:
  rec_get_nth_field(): Return pointer to the field, even to NULL fields.
  rec_set_nth_field(): Make more accurate debug assertions.


innobase/include/rem0rec.ic:
  rec_get_nth_field(): Return pointer to the field, even to NULL fields.
  rec_set_nth_field(): Make more accurate debug assertions.
innobase/rem/rem0rec.c:
  rec_init_offsets(): Make the function comment more accurate.