Bug#25495714: FOREIGN KEY INFORMATION IN NEW DD NOT FOLLOW

              THE LOWER CASE TABLE NAME SETTING

Post-push fix: Fix off-by-one error that caused
innodb.innodb_bug12661768 to fail on Windows.

Author: jhauglid

sql/sql_table.cc

@@ -5875,7 +5875,7 @@ static bool prepare_foreign_key(THD *thd,
     fk_info->ref_db= fk_key->ref_db;
     if (lower_case_table_names == 1) // Store lowercase if LCTN = 1
     {
-      char buff[NAME_CHAR_LEN];
+      char buff[NAME_CHAR_LEN + 1];
       my_stpncpy(buff, fk_info->ref_db.str, NAME_CHAR_LEN);
       my_casedn_str(system_charset_info, buff);
       fk_info->ref_db.str= sql_strdup(buff);
@@ -5888,7 +5888,7 @@ static bool prepare_foreign_key(THD *thd,
   fk_info->ref_table= fk_key->ref_table;
   if (lower_case_table_names == 1) // Store lowercase if LCTN = 1
   {
-    char buff[NAME_CHAR_LEN];
+    char buff[NAME_CHAR_LEN + 1];
     my_stpncpy(buff, fk_info->ref_table.str, NAME_CHAR_LEN);
     my_casedn_str(system_charset_info, buff);
     fk_info->ref_table.str= sql_strdup(buff);