Staging: comedi: hwdrv_apci3501.h: make a variable static.

Cleans up the sparse warning.

Cc: Ian Abbott <abbotti@mev.co.uk>
Cc: Frank Mori Hess <fmhess@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/comedi/drivers/addi-data/hwdrv_apci3501.h

@@ -32,7 +32,7 @@
 #define MODE0                                     0
 #define MODE1                                     1
 /* ANALOG OUTPUT RANGE */
-struct comedi_lrange range_apci3501_ao = { 2, {
+static struct comedi_lrange range_apci3501_ao = { 2, {
 					BIP_RANGE(10),
 					UNI_RANGE(10)
 					}