From 1483ab6a88edd904513b21596d8ef61838418ef4 Mon Sep 17 00:00:00 2001
From: Jon Trulson <jtrulson@ics.com>
Date: Tue, 25 Oct 2016 16:40:09 -0600
Subject: [PATCH] ds18b20: add additional check for no devices found

Signed-off-by: Jon Trulson <jtrulson@ics.com>
---
 src/ds18b20/ds18b20.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/ds18b20/ds18b20.c b/src/ds18b20/ds18b20.c
index 11eb06d4..bfee586c 100644
--- a/src/ds18b20/ds18b20.c
+++ b/src/ds18b20/ds18b20.c
@@ -144,7 +144,7 @@ ds18b20_context ds18b20_init(unsigned int uart)
       rv = mraa_uart_ow_rom_search(dev->ow, 0, id);
     }
 
-  if (!dev->numDevices)
+  if (!dev->numDevices || !dev->devices)
     {
       printf("%s: no DS18B20 devices found on bus\n", __FUNCTION__);
       ds18b20_close(dev);