dm: power: Tidy up debugging output and return values

The currect PMIC debugging is a little confusing. Adjust it so that it is
clear whether the operation succeeded or failed. Also, avoid creating a new
error return value when a perfectly good one is already available.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/power/regulator/regulator-uclass.c b/drivers/power/regulator/regulator-uclass.c
index 4241a4c..fec2886 100644
--- a/drivers/power/regulator/regulator-uclass.c
+++ b/drivers/power/regulator/regulator-uclass.c
@@ -178,7 +178,7 @@
 		printf("; set %d uA", uc_pdata->min_uA);
 	printf("; enabling");
 	if (ret)
-		printf(" (ret: %d)\n", ret);
+		printf(" (ret: %d)", ret);
 	printf("\n");
 }