alsa: Do not call alsa shutdown functions if alsa wasn't yet initialized.

This might happen if the wng is destroyed before any output was
produced. This bug could trigger

	para_audiod: pcm.c:1105: snd_pcm_drain: Assertion `pcm' failed

causing audiod to crash.

diff --git a/alsa_write.c b/alsa_write.c
index 4bf89297f77badcdc737e56a2fcaa888cdaef56e..e070399d3f0dbf0145fa39e090b46d5f7c6cbb63 100644 (file)
--- a/alsa_write.c
+++ b/alsa_write.c
@@ -211,9 +211,12 @@ static void alsa_close(struct writer_node *wn)
 {
        struct private_alsa_write_data *pad = wn->private_data;
        PARA_INFO_LOG("closing writer node %p\n", wn);
-       snd_pcm_drain(pad->handle);
-       snd_pcm_close(pad->handle);
-       snd_config_update_free_global();
+
+       if (pad->handle) {
+               snd_pcm_drain(pad->handle);
+               snd_pcm_close(pad->handle);
+               snd_config_update_free_global();
+       }
        free(pad);
 }