Staging: comedi: das08_cs.c: Checkpatch cleanup

ERROR: code indent should use tabs where possible
+        NONE$

ERROR: do not initialise statics to 0 or NULL
+static struct pcmcia_device *cur_dev = NULL;
Signed-off-by: Andrea Gelmini <andrea.gelmini@gelma.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/comedi/drivers/das08_cs.c

@@ -34,7 +34,7 @@ This is the PCMCIA-specific support split off from the
 das08 driver.
 
 Options (for pcm-das08):
-        NONE
+	NONE
 
 Command support does not exist, but could be added for this board.
 */
@@ -52,7 +52,7 @@ Command support does not exist, but could be added for this board.
 #include <pcmcia/cistpl.h>
 #include <pcmcia/ds.h>
 
-static struct pcmcia_device *cur_dev = NULL;
+static struct pcmcia_device *cur_dev;
 
 #define thisboard ((const struct das08_board_struct *)dev->board_ptr)