net: dsa: sja1105: fix memory leak in sja1105_setup_devlink_regions()

[ Upstream commit 78a9ea43 ]

When dsa_devlink_region_create failed in sja1105_setup_devlink_regions(),
priv->regions is not released.

Fixes: bf425b82

 ("net: dsa: sja1105: expose static config as devlink region")
Signed-off-by: Zhengchao Shao <shaozhengchao@huawei.com>
Reviewed-by: Vladimir Oltean <olteanv@gmail.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Link: https://lore.kernel.org/r/20221205012132.2110979-1-shaozhengchao@huawei.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>