drm: Replace filp in ioctl arguments with drm_file *file_priv.

As a fallout, replace filp storage with file_priv storage for "unique
identifier of a client" all over the DRM.  There is a 1:1 mapping, so this
should be a noop.  This could be a minor performance improvement, as everyth
on Linux dereferenced filp to get file_priv anyway, while only the mmap ioct
went the other direction.

Signed-off-by: Dave Airlie <airlied@linux.ie>
diff --git a/drivers/char/drm/r128_drv.h b/drivers/char/drm/r128_drv.h
index 2835aa3..580b182 100644
--- a/drivers/char/drm/r128_drv.h
+++ b/drivers/char/drm/r128_drv.h
@@ -156,7 +156,8 @@
 extern void r128_driver_irq_postinstall(struct drm_device * dev);
 extern void r128_driver_irq_uninstall(struct drm_device * dev);
 extern void r128_driver_lastclose(struct drm_device * dev);
-extern void r128_driver_preclose(struct drm_device * dev, DRMFILE filp);
+extern void r128_driver_preclose(struct drm_device * dev,
+				 struct drm_file *file_priv);
 
 extern long r128_compat_ioctl(struct file *filp, unsigned int cmd,
 			      unsigned long arg);