ALSA: pci: don't opencode IS_REACHABLE()

Signed-off-by: Fabian Frederick <fabf@skynet.be>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/pci/cs4281.c b/sound/pci/cs4281.c
index 615d8a9..8f0f5f2 100644
--- a/sound/pci/cs4281.c
+++ b/sound/pci/cs4281.c
@@ -1194,7 +1194,7 @@
  * joystick support
  */
 
-#if defined(CONFIG_GAMEPORT) || (defined(MODULE) && defined(CONFIG_GAMEPORT_MODULE))
+#if IS_REACHABLE(CONFIG_GAMEPORT)
 
 static void snd_cs4281_gameport_trigger(struct gameport *gameport)
 {