[ALSA] make sound/isa/gus/gusextreme.c:devices static

'devices' is not a good name for a global variable.
Thankfully, it can become static.
Signed-off-by: NAdrian Bunk <bunk@stusta.de>
Signed-off-by: NTakashi Iwai <tiwai@suse.de>
Signed-off-by: NJaroslav Kysela <perex@suse.cz>

sound/isa/gus/gusextreme.c

@@ -87,7 +87,7 @@ MODULE_PARM_DESC(channels, "GF1 channels for GUS Extreme driver.");
 module_param_array(pcm_channels, int, NULL, 0444);
 MODULE_PARM_DESC(pcm_channels, "Reserved PCM channels for GUS Extreme driver.");
 
-struct platform_device *devices[SNDRV_CARDS];
+static struct platform_device *devices[SNDRV_CARDS];
 
 
 #define PFX	"gusextreme: "