net: dsa: tag_8021q: avoid leaking ctx on dsa_tag_8021q_register() error path

net: dsa: tag_8021q: avoid leaking ctx on dsa_tag_8021q_register() error path

[ Upstream commit edc331e08e301464fa2046b53db5aab9d82d7cc6 ]

If dsa_tag_8021q_setup() fails, for example due to the inability of the
device to install a VLAN, the tag_8021q context of the switch will leak.
Make sure it is freed on the error path.

Fixes: ee3f0b58ad79 ("net: dsa: tag_8021q: absorb dsa_8021q_setup into dsa_tag_8021q_{,un}register")
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Link: https://lore.kernel.org/r/20221209235242.480344-1-vladimir.oltean@nxp.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>