CVE-2022-50114 net: 9p: fix refcount leak in p9_read_work() error handling

[
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    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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      "net/9p/trans_fd.c"
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      {
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      {
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]