ASoC: Intel: avs: Copy only as many RX bytes as necessary

There is no need to copy number of bytes specified by IPC message caller
if DSP firmware returned lower number. In consequence, LARGE_CONFIG_GET
handler is simplified.
Signed-off-by: Cezary Rojewski <cezary.rojewski@intel.com>
Link: https://lore.kernel.org/r/20220707124153.1858249-5-cezary.rojewski@intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/intel/avs/ipc.c

@@ -480,6 +480,7 @@ static int avs_dsp_do_send_msg(struct avs_dev *adev, struct avs_ipc_msg *request
 	ret = ipc->rx.rsp.status;
 	if (reply) {
 		reply->header = ipc->rx.header;
+		reply->size = ipc->rx.size;
 		if (reply->data && ipc->rx.size)
 			memcpy(reply->data, ipc->rx.data, reply->size);
 	}

sound/soc/intel/avs/messages.c

@@ -378,7 +378,6 @@ int avs_ipc_get_large_config(struct avs_dev *adev, u16 module_id, u8 instance_id
 	union avs_module_msg msg = AVS_MODULE_REQUEST(LARGE_CONFIG_GET);
 	struct avs_ipc_msg request;
 	struct avs_ipc_msg reply = {{0}};
-	size_t size;
 	void *buf;
 	int ret;
 
@@ -406,15 +405,14 @@ int avs_ipc_get_large_config(struct avs_dev *adev, u16 module_id, u8 instance_id
 		return ret;
 	}
 
-	size = reply.rsp.ext.large_config.data_off_size;
-	buf = krealloc(reply.data, size, GFP_KERNEL);
+	buf = krealloc(reply.data, reply.size, GFP_KERNEL);
 	if (!buf) {
 		kfree(reply.data);
 		return -ENOMEM;
 	}
 
 	*reply_data = buf;
-	*reply_size = size;
+	*reply_size = reply.size;
 
 	return 0;
 }