Add missing arg to debug message

BUG=none
BRANCH=all
TEST=none

Change-Id: Ic7b318fbc05a2b25f4923d08381186c8b37a5999
Signed-off-by: Bill Richardson <wfrichar@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/475117
Reviewed-by: Randall Spangler <rspangler@chromium.org>
diff --git a/futility/cmd_vbutil_kernel.c b/futility/cmd_vbutil_kernel.c
index 01c511f..cdd4492 100644
--- a/futility/cmd_vbutil_kernel.c
+++ b/futility/cmd_vbutil_kernel.c
@@ -197,7 +197,7 @@
 	}
 	Debug("%s size is 0x%x\n", filename, file_size);
 	if (file_size < opt_pad)
-		Fatal("%s is too small to be a valid kernel blob\n");
+		Fatal("%s is too small to be a valid kernel blob\n", filename);
 
 	Debug("Reading %s\n", filename);
 	fp = fopen(filename, "rb");