ALSA: msnd: add module description and license for the snd-msnd-lib

The missing module license generates warning
during module loading.

Signed-off-by: Krzysztof Helt <krzysztof.h1@wp.pl>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/isa/msnd/msnd.c b/sound/isa/msnd/msnd.c
index 264e082..9064544 100644
--- a/sound/isa/msnd/msnd.c
+++ b/sound/isa/msnd/msnd.c
@@ -700,3 +700,6 @@
 }
 EXPORT_SYMBOL(snd_msnd_pcm);
 
+MODULE_DESCRIPTION("Common routines for Turtle Beach Multisound drivers");
+MODULE_LICENSE("GPL");
+