buffered_file.c: minor integrate

Change-Id: Ibe4acc763527d5323a06b8254190cabc990c67ce
diff --git a/buffered_file.c b/buffered_file.c
index 5e9484e..a661570 100644
--- a/buffered_file.c
+++ b/buffered_file.c
@@ -14,7 +14,6 @@
 #include "qemu-common.h"
 #include "hw/hw.h"
 #include "qemu-timer.h"
-#include "sysemu.h"
 #include "qemu-char.h"
 #include "buffered_file.h"