Having broken .frm, particulary number of field names does
not match number of fields, causes server crash.

Refuse to open a table if number of field names in a table
is not equal to number of fields in a table.

No test case, since it requires broken .frm file.


sql/table.cc:
  Refuse to open a table if number of field names in a table
  is not equal to number of fields in a table.