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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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Original file line number	Diff line number	Diff line change
`@@ -152,6 +152,7 @@ libpqrcv_identify_system(TimeLineID *primary_tli)`
`152`	`152`	`GetSystemIdentifier());`
`153`	`153`	`if (strcmp(primary_sysid,standby_sysid)!=0)`
`154`	`154`	`{`
	`155`	`+primary_sysid=pstrdup(primary_sysid);`
`155`	`156`	`PQclear(res);`
`156`	`157`	`ereport(ERROR,`
`157`	`158`	`(errmsg("database system identifier differs between the primary and standby"),`

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