Remove an unused variable.

Author: dr-m

storage/innobase/row/row0mysql.cc

@@ -4077,13 +4077,11 @@ row_drop_table_for_mysql(
 
 switch (err) {
 ulint	space_id;
-boolfile_unreadable;
 boolis_discarded;
 ulint	table_flags;
 
 case DB_SUCCESS:
 space_id = table->space;
-file_unreadable = table->file_unreadable;
 is_discarded = dict_table_is_discarded(table);
 table_flags = table->flags;
 ut_ad(!dict_table_is_temporary(table));