da9052-battery: Add missing platform_set_drvdata

Add missing platform_set_drvdata in da9052_bat_probe.
Otherwise, calling platform_get_drvdata in da9052_bat_remove returns NULL.

Signed-off-by: Axel Lin <axel.lin@gmail.com>
Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>
diff --git a/drivers/power/da9052-battery.c b/drivers/power/da9052-battery.c
index e8ea47a..07d5b36 100644
--- a/drivers/power/da9052-battery.c
+++ b/drivers/power/da9052-battery.c
@@ -612,6 +612,7 @@
 	 if (ret)
 		goto err;
 
+	platform_set_drvdata(pdev, bat);
 	return 0;
 
 err: