innobase/btr/btr0btr.c:
  Code formatting: add blank line before "goto", do not indent labels
innobase/btr/btr0cur.c:
  Code formatting: add blank line before "goto"
innobase/btr/btr0pcur.c:
  btr_pcur_restore_position(): Replace assertion on cursor->pos_state
  with if condition, to provide better diagnostics. Restore ut_a()
  assertions on cursor->old_rec and cursor->old_n_fields.
innobase/btr/btr0sea.c:
  btr_search_check_guess(): Declare prev_rec and next_rec closer
  to usage.  Add blank lines before goto statements.