From ce375f2a396c4735a12e9105595d7c9f1a366abb Mon Sep 17 00:00:00 2001
From: Uwe Hermann <uwe@hermann-uwe.de>
Date: Wed, 8 Mar 2017 19:33:18 +0100
Subject: [PATCH] sr_usbtmc_dev_inst_free(): Allow NULL as argument.

---
 src/device.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/device.c b/src/device.c
index a8f6f2b4..d87d2904 100644
--- a/src/device.c
+++ b/src/device.c
@@ -489,6 +489,9 @@ SR_PRIV struct sr_usbtmc_dev_inst *sr_usbtmc_dev_inst_new(const char *device)
 /** @private */
 SR_PRIV void sr_usbtmc_dev_inst_free(struct sr_usbtmc_dev_inst *usbtmc)
 {
+	if (!usbtmc)
+		return;
+
 	g_free(usbtmc->device);
 	g_free(usbtmc);
 }