Fix a bug in audio_alsa.c when there is no hardware device name.

diff --git a/audio_alsa.c b/audio_alsa.c
index 62db843fc17bad80db2e50387b8daae52d167044..9a37f3f64ae9b84405549b36d12dfe77acee322a 100644 (file)
--- a/audio_alsa.c
+++ b/audio_alsa.c
@@ -189,7 +189,9 @@ static int precision_delay_available() {
     // this is very crude -- if the device is a hardware device, then it's assumed the delay is
     // precise
     const char *output_device_name = snd_pcm_name(alsa_handle);
-    int is_a_real_hardware_device = (strstr(output_device_name, "hw:") == output_device_name);
+    int is_a_real_hardware_device = 0;
+    if (output_device_name != NULL)
+      is_a_real_hardware_device = (strstr(output_device_name, "hw:") == output_device_name);
 
     // The criteria as to whether precision delay is available
     // is whether the device driver returns non-zero update timestamps