um: vector: Fix memory leak in vector_config

stable inclusion
from stable-v5.10.173
commit f2b9c4544e3bd60f353732291300097b0e8d8454
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I8BFR3

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=f2b9c4544e3bd60f353732291300097b0e8d8454



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[ Upstream commit 8f88c73a ]

If the return value of the uml_parse_vector_ifspec function is NULL,
we should call kfree(params) to prevent memory leak.

Fixes: 49da7e64 ("High Performance UML Vector Network Driver")
Signed-off-by: Xiang Yang <xiangyang3@huawei.com>
Acked-By: Anton Ivanov <anton.ivanov@kot-begemot.co.uk>
Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: sanglipeng <sanglipeng1@jd.com>