Fix typo bug that cause myisam repair to fail

We need to return TRUE if got_error == 1, not error, which is
initialized to FALSE.

storage/maria/ma_sort.c

@@ -335,7 +335,7 @@ static ha_rows find_all_keys(MARIA_SORT_PARAM *info, uint keys,
 
 static my_bool _ma_thr_find_all_keys_exec(MARIA_SORT_PARAM* sort_param)
 {
-  my_bool error= FALSE;
+  int error= 0;
   ulonglong memavl, old_memavl;
   uint UNINIT_VAR(keys), idx;
   uint sort_length;

storage/myisam/sort.c

@@ -326,12 +326,12 @@ static my_bool thr_find_all_keys_exec(MI_SORT_PARAM *sort_param)
   uint sort_length;
   uint maxbuffer;
   uchar **sort_keys= NULL;
-  my_bool error= FALSE;
+  int error= 0;
   DBUG_ENTER("thr_find_all_keys");
   DBUG_PRINT("enter", ("master: %d", sort_param->master));
 
   if (sort_param->sort_info->got_error)
-    DBUG_RETURN(error);
+    DBUG_RETURN(TRUE);
 
   set_sort_param_read_write(sort_param);