[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 <[e-mail]>
Signed-off-by: Mauro Carvalho Chehab <[e-mail]>

drivers/media/pci/cx25821/cx25821-audio-upstream.c

···
 	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,