cmd: sf: use correct printf code

test->time_ms[] is defined as unsigned. So use %u for printf().

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/cmd/sf.c b/cmd/sf.c
index 84bb057..738ef0e 100644
--- a/cmd/sf.c
+++ b/cmd/sf.c
@@ -413,7 +413,7 @@
 		do_div(speed, test->time_ms[stage] * 1024);
 	bps = speed * 8;
 
-	printf("%d %s: %d ticks, %d KiB/s %d.%03d Mbps\n", stage,
+	printf("%d %s: %u ticks, %d KiB/s %d.%03d Mbps\n", stage,
 	       stage_name[stage], test->time_ms[stage],
 	       (int)speed, bps / 1000, bps % 1000);
 }