[ALSA] Remove redundant NULL checks before kfree

Timer Midlevel,ALSA sequencer,ALSA<-OSS sequencer,Digigram VX core
I2C tea6330t,GUS Library,VIA82xx driver,VIA82xx-modem driver
CA0106 driver,CS46xx driver,EMU10K1/EMU10K2 driver,YMFPCI driver
Digigram VX Pocket driver,Common EMU synth,USB generic driver,USB USX2Y
Checking a pointer for NULL before calling kfree() on it is redundant,
kfree() deals with NULL pointers just fine.
This patch removes such checks from sound/

This patch also makes another, but closely related, change.
It avoids casting pointers about to be kfree()'ed.

Signed-off-by: Jesper Juhl <juhl-lkml@dif.dk>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/pci/via82xx_modem.c b/sound/pci/via82xx_modem.c
index e10fceb..5896d28 100644
--- a/sound/pci/via82xx_modem.c
+++ b/sound/pci/via82xx_modem.c
@@ -352,10 +352,8 @@
 		snd_dma_free_pages(&dev->table);
 		dev->table.area = NULL;
 	}
-	if (dev->idx_table) {
-		kfree(dev->idx_table);
-		dev->idx_table = NULL;
-	}
+	kfree(dev->idx_table);
+	dev->idx_table = NULL;
 	return 0;
 }