drm/nouveau/nouveau_bo: fix potential memory leak in nouveau_bo_alloc()

stable inclusion
from stable-v5.10.150
commit 3339a51bcd89fce33011abf226b17c1c522b5e24
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I6D0XA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=3339a51bcd89fce33011abf226b17c1c522b5e24



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[ Upstream commit 6dc54874 ]

nouveau_bo_alloc() allocates a memory chunk for "nvbo" with kzalloc().
When some error occurs, "nvbo" should be released. But when
WARN_ON(pi < 0)) equals true, the function return ERR_PTR without
releasing the "nvbo", which will lead to a memory leak.

We should release the "nvbo" with kfree() if WARN_ON(pi < 0)) equals true.

Signed-off-by: Jianglei Nie <niejianglei2021@163.com>
Signed-off-by: Lyude Paul <lyude@redhat.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220705094306.2244103-1-niejianglei2021@163.com


Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Jialin Zhang <zhangjialin11@huawei.com>