spi: spi-nuc900: Remove redundant platform_set_drvdata()

Setting platform data to NULL is not necessary.

Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Mark Brown <broonie@linaro.org>
diff --git a/drivers/spi/spi-nuc900.c b/drivers/spi/spi-nuc900.c
index b3f9ec8..150d854 100644
--- a/drivers/spi/spi-nuc900.c
+++ b/drivers/spi/spi-nuc900.c
@@ -459,8 +459,6 @@
 
 	free_irq(hw->irq, hw);
 
-	platform_set_drvdata(dev, NULL);
-
 	spi_bitbang_stop(&hw->bitbang);
 
 	clk_disable(hw->clk);