Input: ad7879-spi - remove redundant spi_set_drvdata

Driver core sets driver data to NULL upon failure or remove.

Signed-off-by: Sachin Kamat <[e-mail]>
Signed-off-by: Dmitry Torokhov <[e-mail]>

drivers/input/touchscreen/ad7879-spi.c

···
 	struct ad7879 *ts = spi_get_drvdata(spi);
 
 	ad7879_remove(ts);
-	spi_set_drvdata(spi, NULL);
 
 	return 0;
 }