staging: comedi: ni_pcimio: remove DRV_NAME define

This define is not used ny the driver. Remove it.
Signed-off-by: NH Hartley Sweeten <hsweeten@visionengravers.com>
Reviewed-by: NIan Abbott <abbotti@mev.co.uk>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/drivers/ni_pcimio.c

@@ -121,8 +121,6 @@ SCXI is probably broken for m-series boards.
 #define PCIMIO 1
 #undef ATMIO
 
-#define DRV_NAME "ni_pcimio"
-
 /* These are not all the possible ao ranges for 628x boards.
  They can do OFFSET +- REFERENCE where OFFSET can be
  0V, 5V, APFI<0,1>, or AO<0...3> and RANGE can