crypto: dcp - Remove redundant platform_set_drvdata()

Commit 0998d06310 (device-core: Ensure drvdata = NULL when no
driver is bound) removes the need to set driver data field to
NULL.

Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Tested-by: Tobias Rauter <tobiasrauter@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/dcp.c

@@ -876,7 +876,6 @@ static int dcp_remove(struct platform_device *pdev)
 	struct dcp_dev *dev;
 	int j;
 	dev = platform_get_drvdata(pdev);
-	platform_set_drvdata(pdev, NULL);
 
 	dma_free_coherent(&pdev->dev,
 			DCP_MAX_PKG * sizeof(struct dcp_hw_packet),