regulator: da903x: make da903x_is_enabled return 0 or 1

Signed-off-by: Mike Rapoport <mike@compulab.co.il>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>
diff --git a/drivers/regulator/da903x.c b/drivers/regulator/da903x.c
index 83101d6..fe77730 100644
--- a/drivers/regulator/da903x.c
+++ b/drivers/regulator/da903x.c
@@ -159,7 +159,7 @@
 	if (ret)
 		return ret;
 
-	return reg_val & (1 << info->enable_bit);
+	return !!(reg_val & (1 << info->enable_bit));
 }
 
 /* DA9030 specific operations */