RDMA/rxe: Remove the unused variable obj

stable inclusion
from stable-v5.10.185
commit 6205c0d9ff8b03603491af6b99160bc1f8134055
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I8L5XP

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=6205c0d9ff8b03603491af6b99160bc1f8134055

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[ Upstream commit f0785358 ]

The member variable obj in struct rxe_task is not needed.
So remove it to save memory.

Link: https://lore.kernel.org/r/20220822011615.805603-4-yanjun.zhu@linux.dev


Signed-off-by: Zhu Yanjun <yanjun.zhu@linux.dev>
Reviewed-by: Li Zhijian <lizhijian@fujitsu.com>
Reviewed-by: Bob Pearson <rpearsonhpe@gmail.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Stable-dep-of: 2a62b621 ("RDMA/rxe: Fix the use-before-initialization error of resp_pkts")
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: sanglipeng <sanglipeng1@jd.com>