NFS: Cleanup unused rpc_clnt variable

stable inclusion
from stable-v5.10.198
commit 598539f38c72aa569f6af93f4857e8ee3d2a5dc4
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I987V5

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=598539f38c72aa569f6af93f4857e8ee3d2a5dc4



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[ Upstream commit e025f0a7 ]

The root rpc_clnt is not used here, clean it up.

Fixes: 4dc73c67 ("NFSv4: keep state manager thread active if swap is enabled")
Signed-off-by: Benjamin Coddington <bcodding@redhat.com>
Reviewed-by: NeilBrown <neilb@suse.de>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Stable-dep-of: 956fd46f ("NFSv4: Fix a state manager thread deadlock regression")
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: sanglipeng <sanglipeng1@jd.com>