[PATCH -next] opp: Fix return in _opp_add_static_v2()

[YueHaibing]

Fix sparse warning:
drivers/opp/of.c:924 _opp_add_static_v2() warn: passing zero to 'ERR_PTR'

For duplicate OPPs 'ret' be set to zero.

Fixes: deac8703da5f ("PM / OPP: _of_add_opp_table_v2(): increment count only if OPP is added")
Signed-off-by: YueHaibing <yuehaibing@xxxxxxxxxx>
---
 drivers/opp/of.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/opp/of.c b/drivers/opp/of.c
index 2a97c6535c4c..c32ae7497392 100644
--- a/drivers/opp/of.c
+++ b/drivers/opp/of.c
@@ -921,7 +921,7 @@ static struct dev_pm_opp *_opp_add_static_v2(struct opp_table *opp_table,
 free_opp:
 	_opp_free(new_opp);
 
-	return ERR_PTR(ret);
+	return ret ? ERR_PTR(ret) : NULL;
 }
 
 /* Initializes OPP tables based on new bindings */
-- 
2.17.1