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>

sound/pci/cs46xx/cs46xx_lib.c

@@ -369,6 +369,7 @@ static void free_module_desc(struct dsp_module_desc *module)
 			kfree(module->segments[i].data);
 		kfree(module->segments);
 	}
+	kfree(module);
 }
 
 /* firmware binary format: