sr_usbtmc_dev_inst_free(): Allow NULL as argument.

diff --git a/src/device.c b/src/device.c
index a8f6f2b4dce9c0695961cbd1ec618f4d5f201ab3..d87d2904a313f74e870a370279cbd64d42110d7a 100644 (file)
--- 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);
 }