[OLK-6.6] [Backport] smb: 修复网络命名空间的引用计数错误问题

CIFS在以下情况下重新连接到服务器会触发oops问题

复现步骤如下：
1. mount CIFS in a non-root netns
2. drop packets from the netns
3. destroy the netns
4. unmount CIFS

oops日志信息如下：
    
```
CIFS: VFS: \\XXXXXXXXXXX has not responded in 15 seconds. Reconnecting...
    CIFS: Serverclose failed 4 times, giving up
    Unable to handle kernel paging request at virtual address 14de99e461f84a07
    Mem abort info:
      ESR = 0x0000000096000004
      EC = 0x25: DABT (current EL), IL = 32 bits
      SET = 0, FnV = 0
      EA = 0, S1PTW = 0
      FSC = 0x04: level 0 translation fault
    Data abort info:
      ISV = 0, ISS = 0x00000004
      CM = 0, WnR = 0
    [14de99e461f84a07] address between user and kernel address ranges
    Internal error: Oops: 0000000096000004 [#1] SMP
    Modules linked in: cls_bpf sch_ingress nls_utf8 cifs cifs_arc4 cifs_md4 dns_resolver tcp_diag inet_diag veth xt_state xt_connmark nf_conntrack_netlink xt_nat xt_statistic xt_MASQUERADE xt_mark xt_addrtype ipt_REJECT nf_reject_ipv4 nft_chain_nat nf_nat xt_conntrack nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 xt_comment nft_compat nf_tables nfnetlink overlay nls_ascii nls_cp437 sunrpc vfat fat aes_ce_blk aes_ce_cipher ghash_ce sm4_ce_cipher sm4 sm3_ce sm3 sha3_ce sha512_ce sha512_arm64 sha1_ce ena button sch_fq_codel loop fuse configfs dmi_sysfs sha2_ce sha256_arm64 dm_mirror dm_region_hash dm_log dm_mod dax efivarfs
    CPU: 5 PID: 2690970 Comm: cifsd Not tainted 6.1.103-109.184.amzn2023.aarch64 #1
    Hardware name: Amazon EC2 r7g.4xlarge/, BIOS 1.0 11/1/2018
    pstate: 00400005 (nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
    pc : fib_rules_lookup+0x44/0x238
    lr : __fib_lookup+0x64/0xbc
    sp : ffff8000265db790
    x29: ffff8000265db790 x28: 0000000000000000 x27: 000000000000bd01
    x26: 0000000000000000 x25: ffff000b4baf8000 x24: ffff00047b5e4580
    x23: ffff8000265db7e0 x22: 0000000000000000 x21: ffff00047b5e4500
    x20: ffff0010e3f694f8 x19: 14de99e461f849f7 x18: 0000000000000000
    x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000
    x14: 0000000000000000 x13: 0000000000000000 x12: 3f92800abd010002
    x11: 0000000000000001 x10: ffff0010e3f69420 x9 : ffff800008a6f294
    x8 : 0000000000000000 x7 : 0000000000000006 x6 : 0000000000000000
    x5 : 0000000000000001 x4 : ffff001924354280 x3 : ffff8000265db7e0
    x2 : 0000000000000000 x1 : ffff0010e3f694f8 x0 : ffff00047b5e4500
    Call trace:
     fib_rules_lookup+0x44/0x238
     __fib_lookup+0x64/0xbc
     ip_route_output_key_hash_rcu+0x2c4/0x398
     ip_route_output_key_hash+0x60/0x8c
     tcp_v4_connect+0x290/0x488
     __inet_stream_connect+0x108/0x3d0
     inet_stream_connect+0x50/0x78
     kernel_connect+0x6c/0xac
     generic_ip_connect+0x10c/0x6c8 [cifs]
     __reconnect_target_unlocked+0xa0/0x214 [cifs]
     reconnect_dfs_server+0x144/0x460 [cifs]
     cifs_reconnect+0x88/0x148 [cifs]
     cifs_readv_from_socket+0x230/0x430 [cifs]
     cifs_read_from_socket+0x74/0xa8 [cifs]
     cifs_demultiplex_thread+0xf8/0x704 [cifs]
     kthread+0xd0/0xd4
    Code: aa0003f8 f8480f13 eb18027f 540006c0 (b9401264)
```

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