From 1a54044299c0da7bc894bf429fa306b236c10b68 Mon Sep 17 00:00:00 2001
From: Uwe Hermann <uwe@hermann-uwe.de>
Date: Tue, 19 Nov 2013 20:09:59 +0100
Subject: [PATCH] serial.c: Minor cosmetic fix.

---
 hardware/common/serial.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/hardware/common/serial.c b/hardware/common/serial.c
index d9f08990..de7f583d 100644
--- a/hardware/common/serial.c
+++ b/hardware/common/serial.c
@@ -253,7 +253,8 @@ SR_PRIV int serial_read(struct sr_serial_dev_inst *serial, void *buf,
 	// 	return SR_ERR;
 	}
 
-	sr_spew("Read %d/%d bytes (fd %d).", ret, count, serial->fd);
+	if (ret >= 0)
+		sr_spew("Read %d/%d bytes (fd %d).", ret, count, serial->fd);
 
 	return ret;
 }