ipv6: addrlabel: fix possible memory leak in ip6addrlbl_net_init
kmemleak report a memory leak as follows: unreferenced object 0xffff8880059c6a00 (size 64): comm "ip", pid 23696, jiffies 4296590183 (age 1755.384s) hex dump (first 32 bytes): 20 01 00 10 00 00 00 00 00 00 00 00 00 00 00 00 ............... 1c 00 00 00 00 00 00 00 00 00 00 00 07 00 00 00 ................ backtrace: [<00000000aa4e7a87>] ip6addrlbl_add+0x90/0xbb0 [<0000000070b8d7f1>] ip6addrlbl_net_init+0x109/0x170 [<000000006a9ca9d4>] ops_init+0xa8/0x3c0 [<000000002da57bf2>] setup_net+0x2de/0x7e0 [<000000004e52d573>] copy_net_ns+0x27d/0x530 [<00000000b07ae2b4>] create_new_namespaces+0x382/0xa30 [<000000003b76d36f>] unshare_nsproxy_namespaces+0xa1/0x1d0 [<0000000030653721>] ksys_unshare+0x3a4/0x780 [<0000000007e82e40>] __x64_sys_unshare+0x2d/0x40 [<0000000031a10c08>] do_syscall_64+0x33/0x40 [<0000000099df30e7>] entry_SYSCALL_64_after_hwframe+0x44/0xa9 We should free all rules when w...
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