ALSA: ctxfi: removed typecast to (struct hw *)

the previous patch of the series has converted the void * to
struct hw * . Now this patch removes the typecasting to (struct hw *)
which is not needed any more.

Signed-off-by: Sudip Mukherjee <sudip@vectorindia.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/pci/ctxfi/ctatc.c b/sound/pci/ctxfi/ctatc.c
index 04e54cc..e536ab9 100644
--- a/sound/pci/ctxfi/ctatc.c
+++ b/sound/pci/ctxfi/ctatc.c
@@ -1235,7 +1235,7 @@
 	}
 
 	if (atc->hw)
-		destroy_hw_obj((struct hw *)atc->hw);
+		destroy_hw_obj(atc->hw);
 
 	/* Destroy device virtual memory manager object */
 	if (atc->vm) {