ALSA: usb-audio: Make ebox44_table static

Fixes the following sparse warning:
sound/usb/mixer_quirks.c:1209:23: warning:
symbol 'ebox44_table' was not declared. Should it be static?

Signed-off-by: Sachin Kamat <[e-mail]>
Signed-off-by: Takashi Iwai <[e-mail]>

sound/usb/mixer_quirks.c

···
  * are valid they presents mono controls as L and R channels of
  * stereo. So we provide a good mixer here.
  */
-struct std_mono_table ebox44_table[] = {
+static struct std_mono_table ebox44_table[] = {
 	{
 		.unitid = 4,
 		.control = 1,