Fix use of free in walsender error handling after a sysid mismatch.
Found via valgrind. The bug exists since the introduction of the walsender, so backpatch to 9.0. Andres Freund
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@ -152,6 +152,7 @@ libpqrcv_identify_system(TimeLineID *primary_tli)
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GetSystemIdentifier());
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if (strcmp(primary_sysid, standby_sysid) != 0)
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{
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primary_sysid = pstrdup(primary_sysid);
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PQclear(res);
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ereport(ERROR,
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(errmsg("database system identifier differs between the primary and standby"),
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