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/via_dma.c b/drivers/char/drm/via_dma.c
index 2d0035f..6d3e4ee 100644
--- a/drivers/char/drm/via_dma.c
+++ b/drivers/char/drm/via_dma.c
@@ -330,7 +330,7 @@
 {
 	DRM_DEVICE;
 
-	LOCK_TEST_WITH_RETURN(dev, filp);
+	LOCK_TEST_WITH_RETURN(dev, file_priv);
 
 	return via_driver_dma_quiescent(dev);
 }
@@ -341,7 +341,7 @@
 	drm_via_cmdbuffer_t cmdbuf;
 	int ret;
 
-	LOCK_TEST_WITH_RETURN(dev, filp);
+	LOCK_TEST_WITH_RETURN(dev, file_priv);
 
 	DRM_COPY_FROM_USER_IOCTL(cmdbuf, (drm_via_cmdbuffer_t __user *) data,
 				 sizeof(cmdbuf));
@@ -386,7 +386,7 @@
 	drm_via_cmdbuffer_t cmdbuf;
 	int ret;
 
-	LOCK_TEST_WITH_RETURN(dev, filp);
+	LOCK_TEST_WITH_RETURN(dev, file_priv);
 
 	DRM_COPY_FROM_USER_IOCTL(cmdbuf, (drm_via_cmdbuffer_t __user *) data,
 				 sizeof(cmdbuf));
@@ -662,7 +662,7 @@
 	drm_via_private_t *dev_priv;
 
 	DRM_DEBUG("via cmdbuf_size\n");
-	LOCK_TEST_WITH_RETURN(dev, filp);
+	LOCK_TEST_WITH_RETURN(dev, file_priv);
 
 	dev_priv = (drm_via_private_t *) dev->dev_private;