ceph: initialize pathlen variable in reconnect_caps_cb

stable inclusion
from stable-v5.10.88
commit 7b4cc168d9ca3eb004969b413c0e0bd08a1fef4d
bugzilla: 186058 https://gitee.com/openeuler/kernel/issues/I4QW6A

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=7b4cc168d9ca3eb004969b413c0e0bd08a1fef4d

--------------------------------

[ Upstream commit ee2a095d ]

The smatch static checker warned about an uninitialized symbol usage in
this function, in the case where ceph_mdsc_build_path returns an error.

It turns out that that case is harmless, but it just looks sketchy.
Initialize the variable at declaration time, and remove the unneeded
setting of it later.

Fixes: a33f6432 ("ceph: encode inodes' parent/d_name in cap reconnect message")
Reported-by: NDan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: NXiubo Li <xiubli@redhat.com>
Reviewed-by: NJeff Layton <jlayton@kernel.org>
Signed-off-by: NIlya Dryomov <idryomov@gmail.com>
Signed-off-by: NSasha Levin <sashal@kernel.org>
Signed-off-by: NChen Jun <chenjun102@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

fs/ceph/mds_client.c

@@ -3696,7 +3696,7 @@ static int reconnect_caps_cb(struct inode *inode, struct ceph_cap *cap,
 	struct ceph_pagelist *pagelist = recon_state->pagelist;
 	struct dentry *dentry;
 	char *path;
-	int pathlen, err;
+	int pathlen = 0, err;
 	u64 pathbase;
 	u64 snap_follows;
 
@@ -3716,7 +3716,6 @@ static int reconnect_caps_cb(struct inode *inode, struct ceph_cap *cap,
 		}
 	} else {
 		path = NULL;
-		pathlen = 0;
 		pathbase = 0;
 	}