gfio: add bs display

Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/fio.h b/fio.h
index 6e11754..919c6cd 100644
--- a/fio.h
+++ b/fio.h
@@ -414,6 +414,7 @@
  */
 extern void print_thread_status(void);
 extern void print_status_init(int);
+extern char *fio_uint_to_kmg(unsigned int val);
 
 /*
  * Thread life cycle. Once a thread has a runstate beyond TD_INITIALIZED, it