Bug#8283 - OPTIMIZE TABLE causes data loss

After merge fix. Renamed 'info' -> 'sort_param'.

storage/myisam/sort.c

@@ -455,7 +455,7 @@ pthread_handler_t thr_find_all_keys(void *arg)
   close_cached_file(&sort_param->tempfile_for_exceptions);
 
 ok:
-  free_root(&info->wordroot, MYF(0));
+  free_root(&sort_param->wordroot, MYF(0));
   /*
     Detach from the share if the writer is involved. Avoid others to
     be blocked. This includes a flush of the write buffer. This will