ALSA: compress: Use kzalloc() for ioctls writing back data

Like the previous patch by Dan, we should clear the data to be
returned from certain compress ioctls, namely,
snd_compr_get_codec_caps() and snd_compr_get_params().
This time, we can simply replace kmalloc() with kzalloc().

Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/core/compress_offload.c b/sound/core/compress_offload.c
index 664c693..a0bc47f 100644
--- a/sound/core/compress_offload.c
+++ b/sound/core/compress_offload.c
@@ -428,7 +428,7 @@
 	if (!stream->ops->get_codec_caps)
 		return -ENXIO;
 
-	caps = kmalloc(sizeof(*caps), GFP_KERNEL);
+	caps = kzalloc(sizeof(*caps), GFP_KERNEL);
 	if (!caps)
 		return -ENOMEM;
 
@@ -545,7 +545,7 @@
 	if (!stream->ops->get_params)
 		return -EBADFD;
 
-	params = kmalloc(sizeof(*params), GFP_KERNEL);
+	params = kzalloc(sizeof(*params), GFP_KERNEL);
 	if (!params)
 		return -ENOMEM;
 	retval = stream->ops->get_params(stream, params);