Staging: comedi: comedi_fops.c: Checkpatch cleanup

Staging: comedi: comedi_fops.c: Checkpatch cleanup

ERROR: do not initialise externals to 0 or NULL
+int comedi_num_legacy_minors = 0;

WARNING: braces {} are not necessary for single statement blocks
+			if (s->subdev_flags & SDF_CMD_READ) {
+				kill_fasync(&dev->async_queue, SIGIO, POLL_IN);
+			}

WARNING: braces {} are not necessary for single statement blocks
+			if (s->subdev_flags & SDF_CMD_WRITE) {
+				kill_fasync(&dev->async_queue, SIGIO, POLL_OUT);
+			}

Signed-off-by: Andrea Gelmini <andrea.gelmini@gelma.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>