dsp: codecs: fix range check for audio buffer copying

The range checking for audio buffer copying in function
"audio_in_write" is using the incorrect buffer size.
Change it to the actual allocated audio buffer size.

Change-Id: Icb9a9e9c3b3d3c6e55e7bad20b34f94784b82674
Signed-off-by: Xiaoyu Ye <[email protected]>

dsp/codecs/audio_utils.c

@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: GPL-2.0-only
-/* Copyright (c) 2010-2018, The Linux Foundation. All rights reserved.
+/* Copyright (c) 2010-2019, The Linux Foundation. All rights reserved.
  */
 
 #include <linux/module.h>
@@ -900,9 +900,8 @@ ssize_t audio_in_write(struct file *file,
 						__func__, audio->ac->session);
 			}
 		}
-		xfer = (count > (audio->pcm_cfg.buffer_size)) ?
-				(audio->pcm_cfg.buffer_size) : count;
 
+		xfer = (count > size) ? size : count;
 		if (copy_from_user(cpy_ptr, buf, xfer)) {
 			rc = -EFAULT;
 			break;