Wrong error code ER_BAD_DB_ERROR for long filenames

set names utf8;

let $save_debug=`select @@debug_dbug`;

let $MYSQLD_DATADIR= `SELECT @@datadir`;

# Filename is too long because it is converted to @274e@274e@274e@274e...

# so each '❎' is 5 bytes in filesystem, 51 x 5 = 255 bytes

let $t= `select repeat('❎', 51)`;

--error ER_CANT_CREATE_TABLE

eval create table $t (x int);

mysqltest: At line 7: query 'create table $t (x int)' failed: ER_BAD_DB_ERROR (1049): Unknown database 'test'

ERROR HY000: Can't create table `test`.`❎❎❎❎❎❎❎❎❎❎❎❎❎❎❎❎❎❎❎❎❎❎❎❎❎❎❎❎❎❎❎❎❎❎❎❎❎❎ ❎❎❎❎❎❎❎❎❎❎❎❎❎` (errno: 36 "File name too long")

int writefile(const char *path, const char *db, const char *table,

              bool tmp_table, const uchar *data, size_t len)

{

...

  File file= mysql_file_create(key_file_frm, path,

                               CREATE_MODE, create_flags, MYF(0));

  if (unlikely((error= file < 0)))

  {

    if (my_errno == ENOENT)

      my_error(ER_BAD_DB_ERROR, MYF(0), db);

    else

      my_error(ER_CANT_CREATE_TABLE, MYF(0), db, table, my_errno);

  }

...