ALSA: cs46xx: Fix memory leak at destructor

The release of module object itself was forgotten.
Spotted by COVERIY CID 1162828.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/pci/cs46xx/cs46xx_lib.c b/sound/pci/cs46xx/cs46xx_lib.c
index f18e587..062398e 100644
--- a/sound/pci/cs46xx/cs46xx_lib.c
+++ b/sound/pci/cs46xx/cs46xx_lib.c
@@ -369,6 +369,7 @@
 			kfree(module->segments[i].data);
 		kfree(module->segments);
 	}
+	kfree(module);
 }
 
 /* firmware binary format: