[media] cx25821: Cleanup filename assignment code

I'm pasting the original code and my proposal on the commit message for
make it easy to compare the two versions.
Line 62 of cx25821-audio-upstream.h contains:
char *_defaultAudioName = "/root/audioGOOD.wav";
Original code after replace kmemdup for kstrdup, and after fix return error
code:
if (dev->input_audiofilename) {
	dev->_audiofilename = kstrdup(dev->input_audiofilename,
				      GFP_KERNEL);
	if (!dev->_audiofilename) {
		err = -ENOMEM;
		goto error;
	}
	/* Default if filename is empty string */
	if (strcmp(dev->input_audiofilename, "") == 0)
		dev->_audiofilename = "/root/audioGOOD.wav";
} else {
	dev->_audiofilename = kstrdup(_defaultAudioName,
				      GFP_KERNEL);
	if (!dev->_audiofilename) {
		err = -ENOMEM;
		goto error;
	}
}
Code proposed in this patch:
if ((dev->input_audiofilename) &&
    (strcmp(dev->input_audiofilename, "") != 0))
	dev->_audiofilename = kstrdup(dev->input_audiofilename,
				      GFP_KERNEL);
else
	dev->_audiofilename = kstrdup(_defaultAudioName,
				      GFP_KERNEL);
if (!dev->_audiofilename) {
	err = -ENOMEM;
	goto error;
}

Signed-off-by: Peter Senna Tschudin <peter.senna@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 6 insertions, 15 deletions

diff --git a/drivers/media/pci/cx25821/cx25821-audio-upstream.c b/drivers/media/pci/cx25821/cx25821-audio-upstream.c
index 87491ca05ee5..ea973202a66c 100644
--- a/drivers/media/pci/cx25821/cx25821-audio-upstream.c
+++ b/drivers/media/pci/cx25821/cx25821-audio-upstream.c
@@ -728,26 +728,17 @@ int cx25821_audio_upstream_init(struct cx25821_dev *dev, int channel_select)
         dev->_audio_lines_count = LINES_PER_AUDIO_BUFFER;
         _line_size = AUDIO_LINE_SIZE;
 
-        if (dev->input_audiofilename) {
+        if ((dev->input_audiofilename) &&
+            (strcmp(dev->input_audiofilename, "") != 0))
                 dev->_audiofilename = kstrdup(dev->input_audiofilename,
                                               GFP_KERNEL);
-
-                if (!dev->_audiofilename) {
-                        err = -ENOMEM;
-                        goto error;
-                }
-
-                /* Default if filename is empty string */
-                if (strcmp(dev->input_audiofilename, "") == 0)
-                        dev->_audiofilename = "/root/audioGOOD.wav";
-        } else {
+        else
                 dev->_audiofilename = kstrdup(_defaultAudioName,
                                               GFP_KERNEL);
 
-                if (!dev->_audiofilename) {
-                        err = -ENOMEM;
-                        goto error;
-                }
+        if (!dev->_audiofilename) {
+                err = -ENOMEM;
+                goto error;
         }
 
         cx25821_sram_channel_setup_upstream_audio(dev, sram_ch,