BUG#24358 - Table access crashes server

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

@@ -373,6 +373,8 @@ int openfrm(const char *name, const char *alias, uint db_stat, uint prgflag,
   memcpy(comment_pos, disk_buff+read_length-com_length, com_length);
 
   fix_type_pointers(&int_array,&outparam->fieldnames,1,&names);
+  if (outparam->fieldnames.count != outparam->fields)
+    goto err_not_open;
   fix_type_pointers(&int_array,outparam->intervals,interval_count,
 		    &names);