[media] cx25821: Use kmemdup rather than duplicating its implementation

---
 drivers/media/video/cx25821/cx25821-audio-upstream.c     | 11 ++++-------
 drivers/media/video/cx25821/cx25821-video-upstream-ch2.c | 12 ++++--------
 drivers/media/video/cx25821/cx25821-video-upstream.c     | 10 ++++------
 3 files changed, 12 insertions(+), 21 deletions(-)
 
diff --git a/drivers/media/video/cx25821/cx25821-audio-upstream.c b/drivers/media/video/cx25821/cx25821-audio-upstream.c
index 4dc2a24..20c7ca3 100644
--- a/drivers/media/video/cx25821/cx25821-audio-upstream.c
+++ b/drivers/media/video/cx25821/cx25821-audio-upstream.c
@@ -733,25 +733,22 @@ int cx25821_audio_upstream_init(struct cx25821_dev *dev, int channel_select)
 
 	if (dev->input_audiofilename) {
 		str_length = strlen(dev->input_audiofilename);
-		dev->_audiofilename = kmalloc(str_length + 1, GFP_KERNEL);
+		dev->_audiofilename = kmemdup(dev->input_audiofilename,
+					      str_length + 1, GFP_KERNEL);
 
 		if (!dev->_audiofilename)
 			goto error;
 
-		memcpy(dev->_audiofilename, dev->input_audiofilename,
-		       str_length + 1);
-
 		/* Default if filename is empty string */
 		if (strcmp(dev->input_audiofilename, "") == 0)
 			dev->_audiofilename = "/root/audioGOOD.wav";
 	} else {
 		str_length = strlen(_defaultAudioName);
-		dev->_audiofilename = kmalloc(str_length + 1, GFP_KERNEL);
+		dev->_audiofilename = kmemdup(_defaultAudioName,
+					      str_length + 1, GFP_KERNEL);
 
 		if (!dev->_audiofilename)
 			goto error;
-
-		memcpy(dev->_audiofilename, _defaultAudioName, str_length + 1);
 	}
 
 	retval = cx25821_sram_channel_setup_upstream_audio(dev, sram_ch,
diff --git a/drivers/media/video/cx25821/cx25821-video-upstream-ch2.c b/drivers/media/video/cx25821/cx25821-video-upstream-ch2.c
index 6401ce8..5a157cf 100644
--- a/drivers/media/video/cx25821/cx25821-video-upstream-ch2.c
+++ b/drivers/media/video/cx25821/cx25821-video-upstream-ch2.c
@@ -747,22 +747,18 @@ int cx25821_vidupstream_init_ch2(struct cx25821_dev *dev, int channel_select,
 
 	if (dev->input_filename_ch2) {
 		str_length = strlen(dev->input_filename_ch2);
-		dev->_filename_ch2 = kmalloc(str_length + 1, GFP_KERNEL);
+		dev->_filename_ch2 = kmemdup(dev->input_filename_ch2,
+					     str_length + 1, GFP_KERNEL);
 
 		if (!dev->_filename_ch2)
 			goto error;
-
-		memcpy(dev->_filename_ch2, dev->input_filename_ch2,
-		       str_length + 1);
 	} else {
 		str_length = strlen(dev->_defaultname_ch2);
-		dev->_filename_ch2 = kmalloc(str_length + 1, GFP_KERNEL);
+		dev->_filename_ch2 = kmemdup(dev->_defaultname_ch2,
+					     str_length + 1, GFP_KERNEL);
 
 		if (!dev->_filename_ch2)
 			goto error;
-
-		memcpy(dev->_filename_ch2, dev->_defaultname_ch2,
-		       str_length + 1);
 	}
 
 	/* Default if filename is empty string */
diff --git a/drivers/media/video/cx25821/cx25821-video-upstream.c b/drivers/media/video/cx25821/cx25821-video-upstream.c
index 1032263..21e7d65 100644
--- a/drivers/media/video/cx25821/cx25821-video-upstream.c
+++ b/drivers/media/video/cx25821/cx25821-video-upstream.c
@@ -794,20 +794,18 @@ int cx25821_vidupstream_init_ch1(struct cx25821_dev *dev, int channel_select,
 
 	if (dev->input_filename) {
 		str_length = strlen(dev->input_filename);
-		dev->_filename = kmalloc(str_length + 1, GFP_KERNEL);
+		dev->_filename = kmemdup(dev->input_filename, str_length + 1,
+					 GFP_KERNEL);
 
 		if (!dev->_filename)
 			goto error;
-
-		memcpy(dev->_filename, dev->input_filename, str_length + 1);
 	} else {
 		str_length = strlen(dev->_defaultname);
-		dev->_filename = kmalloc(str_length + 1, GFP_KERNEL);
+		dev->_filename = kmemdup(dev->_defaultname, str_length + 1,
+					 GFP_KERNEL);
 
 		if (!dev->_filename)
 			goto error;
-
-		memcpy(dev->_filename, dev->_defaultname, str_length + 1);
 	}
 
 	/* Default if filename is empty string */