[PATCH 5.10 0/1] 9p/net: fix possible memory leak in p9_check_errors()

Syzkaller reports "memory leak in p9pdu_readf" in 5.10 stable releases. I've attached reproducers in Bugzilla [1].

The problem has been fixed by the following patch which can be applied to the 5.10 branch. The fix is already present in all stable branches starting from 5.15.

[1] https://bugzilla.kernel.org/show_bug.cgi?id=218235

Found by Linux Verification Center (linuxtesting.org) with Syzkaller.