audio: initialize ausrc_prm

src/audio.c

@@ -1059,6 +1059,7 @@ static int start_source(struct autx *tx, struct audio *a, struct list *ausrcl)
 		size_t sz;
 		size_t psize_alloc;
 
+		memset(&prm, 0, sizeof(prm));
 		prm.srate      = srate_dsp;
 		prm.ch         = channels_dsp;
 		prm.ptime      = tx->ptime;