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Initialize variable to placate compiler.

I don't think there's a real problem here, because if we reachthe loop over 'tles' then we will either find at least oneTimeLineHistoryEntry such that oldest_segno != 0, in which caseunsummarized_lsn will be initialized, or else unsummarized_tliwill remain 0 and an error will occur before unsummarized_lsnis used for anything. But some compilers are complainining, asreported on list by Nathan Bossart and off-list by Andrew Dunstan.Discussion:http://postgr.es/m/20231223215147.GA69623@nathanxps13

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src/backend/postmaster
- walsummarizer.c

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`‎src/backend/postmaster/walsummarizer.c`

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Original file line number	Diff line number	Diff line change
`@@ -438,7 +438,7 @@ GetOldestUnsummarizedLSN(TimeLineID tli, bool lsn_is_exact,`
`438`	`438`	`LWLockModemode=reset_pending_lsn ?LW_EXCLUSIVE :LW_SHARED;`
`439`	`439`	`intn;`
`440`	`440`	`List*tles;`
`441`		`-XLogRecPtrunsummarized_lsn;`
	`441`	`+XLogRecPtrunsummarized_lsn=InvalidXLogRecPtr;`
`442`	`442`	`TimeLineIDunsummarized_tli=0;`
`443`	`443`	`boolshould_make_exact= false;`
`444`	`444`	`List*existing_summaries;`

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Commitda083b2

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`‎src/backend/postmaster/walsummarizer.c`

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