Staging: vme: silence a Sparse warning

Sparse complains that "arg" is not a __user pointer.  The "argp" and
"arg" variables are equivalent but argp is declared as a __user pointer.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-By: Martyn Welch <martyn.welch@ge.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/vme/devices/vme_user.c

@@ -474,7 +474,7 @@ static int vme_user_ioctl(struct inode *inode, struct file *file,
 	case CONTROL_MINOR:
 		switch (cmd) {
 		case VME_IRQ_GEN:
-			copied = copy_from_user(&irq_req, (char *)arg,
+			copied = copy_from_user(&irq_req, argp,
 						sizeof(struct vme_irq_id));
 			if (copied != 0) {
 				printk(KERN_WARNING "Partial copy from userspace\n");