Free/alloc every FIO_OPT_STR_STORE string

Makes ownership clear, though the freeing is a bit anal.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/init.c b/init.c
index e5d776c..c1f774d 100644
--- a/init.c
+++ b/init.c
@@ -116,6 +116,7 @@
 	*td = *parent;
 
 	dup_files(td, parent);
+	options_mem_dupe(td);
 
 	td->thread_number = thread_number;
 	return td;
@@ -801,6 +802,7 @@
 	}
 
 	free(ini_file);
+	options_mem_free(&def_thread);
 
 	if (!thread_number) {
 		log_err("No jobs defined(s)\n");