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Guard against null t->tm_zone in strftime.c.

The upstream IANA code does not guard against null TM_ZONE pointers in thisfunction, but in our code there is such a check in the other pre-existinguse of t->tm_zone. We do have some places that set pg_tm.tm_zone to NULL.I'm not entirely sure it's possible to reach strftime with such a value,but I'm not sure it isn't either, so be safe.Per Coverity complaint.

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src/timezone
- strftime.c

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`‎src/timezone/strftime.c`

Lines changed: 2 additions & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -459,7 +459,8 @@ _fmt(const char format, const struct pg_tm t, char pt, const char ptlim,`
`459`	`459`	`negative=diff<0;`
`460`	`460`	`if (diff==0)`
`461`	`461`	`{`
`462`		`-negative=t->tm_zone[0]=='-';`
	`462`	`+if (t->tm_zone!=NULL)`
	`463`	`+negative=t->tm_zone[0]=='-';`
`463`	`464`	`}`
`464`	`465`	`if (negative)`
`465`	`466`	`{`

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Commit9e5f3d0

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`‎src/timezone/strftime.c`

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