[PATCH v3 10/17] audio/alsaaudio: Replace ALSA alloca() by malloc() equivalent

["Philippe Mathieu-Daudé" <philmd@redhat.com>]

The ALLOCA(3) man-page mentions its "use is discouraged".

Define the cleanup functions for the snd_pcm_[hw/sw]_params_t types,
and replace the ALSA alloca() calls by equivalent ALSA malloc().

Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
 audio/alsaaudio.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/audio/alsaaudio.c b/audio/alsaaudio.c
index fcc2f62864f..f39061ebc42 100644
--- a/audio/alsaaudio.c
+++ b/audio/alsaaudio.c
@@ -70,6 +70,9 @@ struct alsa_params_obt {
     snd_pcm_uframes_t samples;
 };
 
+G_DEFINE_AUTOPTR_CLEANUP_FUNC(snd_pcm_hw_params_t, snd_pcm_hw_params_free)
+G_DEFINE_AUTOPTR_CLEANUP_FUNC(snd_pcm_sw_params_t, snd_pcm_sw_params_free)
+
 static void GCC_FMT_ATTR (2, 3) alsa_logerr (int err, const char *fmt, ...)
 {
     va_list ap;
@@ -410,9 +413,9 @@ static void alsa_dump_info (struct alsa_params_req *req,
 static void alsa_set_threshold (snd_pcm_t *handle, snd_pcm_uframes_t threshold)
 {
     int err;
-    snd_pcm_sw_params_t *sw_params;
+    g_autoptr(snd_pcm_sw_params_t) sw_params = NULL;
 
-    snd_pcm_sw_params_alloca (&sw_params);
+    snd_pcm_sw_params_malloc(&sw_params);
 
     err = snd_pcm_sw_params_current (handle, sw_params);
     if (err < 0) {
@@ -444,7 +447,7 @@ static int alsa_open(bool in, struct alsa_params_req *req,
     AudiodevAlsaOptions *aopts = &dev->u.alsa;
     AudiodevAlsaPerDirectionOptions *apdo = in ? aopts->in : aopts->out;
     snd_pcm_t *handle;
-    snd_pcm_hw_params_t *hw_params;
+    g_autoptr(snd_pcm_hw_params_t) hw_params = NULL;
     int err;
     unsigned int freq, nchannels;
     const char *pcm_name = apdo->has_dev ? apdo->dev : "default";
@@ -455,7 +458,7 @@ static int alsa_open(bool in, struct alsa_params_req *req,
     freq = req->freq;
     nchannels = req->nchannels;
 
-    snd_pcm_hw_params_alloca (&hw_params);
+    snd_pcm_hw_params_malloc(&hw_params);
 
     err = snd_pcm_open (
         &handle,
-- 
2.26.3