next: drm/atomic: Use copy_from_user to copy 64 bit data from user space

Copying 64 bit data from user space using get_user is not supported
on all architectures, and may result in the following build error.

ERROR: "__get_user_bad" [drivers/gpu/drm/drm.ko] undefined!

Avoid the problem by using copy_from_user.

Fixes: d34f20d ("drm: Atomic modeset ioctl")
Cc: Rob Clark <robdclark@gmail.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/drm_atomic.c

@@ -1259,7 +1259,9 @@ int drm_mode_atomic_ioctl(struct drm_device *dev,
 				goto fail;
 			}
 
-			if (get_user(prop_value, prop_values_ptr + copied_props)) {
+			if (copy_from_user(&prop_value,
+					   prop_values_ptr + copied_props,
+					   sizeof(prop_value))) {
 				ret = -EFAULT;
 				goto fail;
 			}