[PATCH] Randomly fill output buffers

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/fio.h b/fio.h
index b30dec5..6a68ec8 100644
--- a/fio.h
+++ b/fio.h
@@ -63,7 +63,7 @@
 	struct timeval start_time;
 	struct timeval issue_time;
 
-	char *buf;
+	void *buf;
 	unsigned int buflen;
 	unsigned long long offset;