staging: kpc2000: remove unused function kp2000_cdev_write

There is no callers in tree, so can be removed.
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/kpc2000/kpc2000/fileops.c

@@ -74,11 +74,6 @@ ssize_t  kp2000_cdev_read(struct file *filp, char __user *buf, size_t count, lof
 	return count;
 }
 
-ssize_t  kp2000_cdev_write(struct file *filp, const char __user *buf, size_t count, loff_t *f_pos)
-{
-	return -EINVAL;
-}
-
 long  kp2000_cdev_ioctl(struct file *filp, unsigned int ioctl_num, unsigned long ioctl_param)
 {
 	struct kp2000_device *pcard = filp->private_data;
@@ -122,9 +117,6 @@ struct file_operations  kp2000_fops = {
 	.open       = kp2000_cdev_open,
 	.release    = kp2000_cdev_close,
 	.read       = kp2000_cdev_read,
-	//.write      = kp2000_cdev_write,
-	//.poll       = kp2000_cdev_poll,
-	//.fasync     = kp2000_cdev_fasync,
 	.llseek     = noop_llseek,
 	.unlocked_ioctl = kp2000_cdev_ioctl,
 };