opp: Fix return in _opp_add_static_v2()

[ Upstream commit 27ff8187f1 ]

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: deac8703da ("PM / OPP: _of_add_opp_table_v2(): increment count only if OPP is added")
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

drivers/opp/of.c

@@ -921,7 +921,7 @@ free_required_opps:
 free_opp:
 	_opp_free(new_opp);
 
-	return ERR_PTR(ret);
+	return ret ? ERR_PTR(ret) : NULL;
 }
 
 /* Initializes OPP tables based on new bindings */