iproto: fix use-after-free in net_end_join
`msg` is used after it is freed in iproto_msg_delete. Close #9037 NO_TEST=tested by ASAN NO_DOC=bugfix
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`msg` is used after it is freed in iproto_msg_delete. Close #9037 NO_TEST=tested by ASAN NO_DOC=bugfix
mentioned in commit a83b5182