vmwgfx: remove useless set memory to zero use memset()

The memory return by kzalloc() or kmem_cache_zalloc() has already
be set to zero, so remove useless memset(0).

Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: Dave Airlie <airlied@redhat.com>

drivers/gpu/drm/vmwgfx/vmwgfx_drv.c

@@ -437,7 +437,6 @@ static int vmw_driver_load(struct drm_device *dev, unsigned long chipset)
 		DRM_ERROR("Failed allocating a device private struct.\n");
 		return -ENOMEM;
 	}
-	memset(dev_priv, 0, sizeof(*dev_priv));
 
 	pci_set_master(dev->pdev);
 

drivers/gpu/drm/vmwgfx/vmwgfx_kms.c

@@ -483,7 +483,6 @@ static int do_surface_dirty_sou(struct vmw_private *dev_priv,
 	}
 
 	/* only need to do this once */
-	memset(cmd, 0, fifo_size);
 	cmd->header.id = cpu_to_le32(SVGA_3D_CMD_BLIT_SURFACE_TO_SCREEN);
 	cmd->header.size = cpu_to_le32(fifo_size - sizeof(cmd->header));