Staging: comedi: ssv_dnp: fix checkpatch.pl warning

Fix checkpatch.pl warning about printk issue by merging two printk
calls into one dev_info call.

Signed-off-by: Güngör Erseymen <gelurine@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>