bugfix: mysqld --safe-mode crashes

Author: vuvova

mysql-test/suite/parts/t/partition_recover_myisam-master.opt

@@ -1 +1 @@
---myisam-recover-options
+--safe-mode

sql/mysqld.cc

@@ -8241,7 +8241,7 @@ mysqld_get_one_option(const struct my_option *opt, const char *argument,
  case (int) OPT_SAFE:
  opt_specialflag|= SPECIAL_SAFE_MODE | SPECIAL_NO_NEW_FUNC;
  SYSVAR_AUTOSIZE(delay_key_write_options, (uint) DELAY_KEY_WRITE_NONE);
- SYSVAR_AUTOSIZE(myisam_recover_options, HA_RECOVER_DEFAULT);
+ myisam_recover_options= HA_RECOVER_DEFAULT;
  ha_open_options&= ~(HA_OPEN_DELAY_KEY_WRITE);
 #ifdef HAVE_QUERY_CACHE
  SYSVAR_AUTOSIZE(query_cache_size, 0);