Bug#20168

  "--default-storage-engine=XXX" doesn't work
  typo in the code and forgotten changes

sql/mysqld.cc

@@ -4983,11 +4983,12 @@ Disable with --skip-bdb (will save memory).",
    (gptr*) &default_collation_name, (gptr*) &default_collation_name,
    0, GET_STR, REQUIRED_ARG, 0, 0, 0, 0, 0, 0 },
   {"default-storage-engine", OPT_STORAGE_ENGINE,
-   "Set the default storage engine (table type) for tables.", 0, 0,
+   "Set the default storage engine (table type) for tables.",
+   (gptr*)&default_storage_engine_str, (gptr*)&default_storage_engine_str,
    0, GET_STR, REQUIRED_ARG, 0, 0, 0, 0, 0, 0},
   {"default-table-type", OPT_STORAGE_ENGINE,
    "(deprecated) Use --default-storage-engine.",
-   (gptr*)default_storage_engine_str, (gptr*)default_storage_engine_str,
+   (gptr*)&default_storage_engine_str, (gptr*)&default_storage_engine_str,
    0, GET_STR, REQUIRED_ARG, 0, 0, 0, 0, 0, 0},
   {"default-time-zone", OPT_DEFAULT_TIME_ZONE, "Set the default time zone.",
    (gptr*) &default_tz_name, (gptr*) &default_tz_name,