drivers/gpu/drm: Remove unnecessary casts of private_data

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

drivers/gpu/drm/radeon/radeon_ttm.c

@@ -631,7 +631,7 @@ int radeon_mmap(struct file *filp, struct vm_area_struct *vma)
 		return drm_mmap(filp, vma);
 	}
 
-	file_priv = (struct drm_file *)filp->private_data;
+	file_priv = filp->private_data;
 	rdev = file_priv->minor->dev->dev_private;
 	if (rdev == NULL) {
 		return -EINVAL;

drivers/gpu/drm/vmwgfx/vmwgfx_fifo.c

@@ -542,7 +542,7 @@ int vmw_fifo_mmap(struct file *filp, struct vm_area_struct *vma)
 	struct drm_file *file_priv;
 	struct vmw_private *dev_priv;
 
-	file_priv = (struct drm_file *)filp->private_data;
+	file_priv = filp->private_data;
 	dev_priv = vmw_priv(file_priv->minor->dev);
 
 	if (vma->vm_pgoff != (dev_priv->mmio_start >> PAGE_SHIFT) ||

drivers/gpu/drm/vmwgfx/vmwgfx_ttm_glue.c

@@ -39,7 +39,7 @@ int vmw_mmap(struct file *filp, struct vm_area_struct *vma)
 		return drm_mmap(filp, vma);
 	}
 
-	file_priv = (struct drm_file *)filp->private_data;
+	file_priv = filp->private_data;
 	dev_priv = vmw_priv(file_priv->minor->dev);
 	return ttm_bo_mmap(filp, vma, &dev_priv->bdev);
 }