drm: fix LOCK_TEST_WITH_RETURN macro

When this macro isn't called with 'file_priv' this will result in a build
failure.
Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>

include/drm/drmP.h

@@ -237,13 +237,13 @@ struct drm_device;
  * \param dev DRM device.
  * \param filp file pointer of the caller.
  */
-#define LOCK_TEST_WITH_RETURN( dev, file_priv )				\
+#define LOCK_TEST_WITH_RETURN( dev, _file_priv )				\
 do {										\
-	if (!_DRM_LOCK_IS_HELD(file_priv->master->lock.hw_lock->lock) ||		\
-	    file_priv->master->lock.file_priv != file_priv)	{			\
+	if (!_DRM_LOCK_IS_HELD(_file_priv->master->lock.hw_lock->lock) ||	\
+	    _file_priv->master->lock.file_priv != _file_priv)	{		\
 		DRM_ERROR( "%s called without lock held, held  %d owner %p %p\n",\
-			   __func__, _DRM_LOCK_IS_HELD(file_priv->master->lock.hw_lock->lock),\
-			   file_priv->master->lock.file_priv, file_priv);		\
+			   __func__, _DRM_LOCK_IS_HELD(_file_priv->master->lock.hw_lock->lock),\
+			   _file_priv->master->lock.file_priv, _file_priv);	\
 		return -EINVAL;							\
 	}									\
 } while (0)