net/9p: fix double req put in p9_fd_cancelled

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CVE-2025-40027 net/9p: fix double req put in p9_fd_cancelled

In the Linux kernel, the following vulnerability has been resolved: net/9p: fix double req put in p9fdcancelled Syzkaller reports a KASAN issue as below: general protection fault, probably for non-canonical address 0xfbd59c0000000021: 0000 1 PREEMPT SMP KASAN NOPTI KASAN: maybe wild-memory-access...