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Fix memory leak with lower, upper and initcap with ICU-provided collations

The leak happens in str_tolower, str_toupper and str_initcap, which areused in several places including their equivalent SQL-level functions,and can only be triggered when using an ICU-provided collation whenconverting the input string.b615920 fixed a similar leak. Backpatch down 10 where ICU collationshave been introduced.Author: Konstantin KnizhnikDiscussion:https://postgr.es/m/94c0ad0a-cbc2-e4a3-7829-2bdeaf9146db@postgrespro.ruBackpatch-through: 10

1 parentf63a5ea commit3a54eb1Copy full SHA for 3a54eb1

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src/backend/utils/adt
- formatting.c

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`‎src/backend/utils/adt/formatting.c`

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Original file line number	Diff line number	Diff line change
`@@ -1584,6 +1584,7 @@ str_tolower(const char *buff, size_t nbytes, Oid collid)`
`1584`	`1584`	`&buff_conv,buff_uchar,len_uchar);`
`1585`	`1585`	`icu_from_uchar(&result,buff_conv,len_conv);`
`1586`	`1586`	`pfree(buff_uchar);`
	`1587`	`+pfree(buff_conv);`
`1587`	`1588`	`}`
`1588`	`1589`	`else`
`1589`	`1590`	`#endif`
`@@ -1707,6 +1708,7 @@ str_toupper(const char *buff, size_t nbytes, Oid collid)`
`1707`	`1708`	`&buff_conv,buff_uchar,len_uchar);`
`1708`	`1709`	`icu_from_uchar(&result,buff_conv,len_conv);`
`1709`	`1710`	`pfree(buff_uchar);`
	`1711`	`+pfree(buff_conv);`
`1710`	`1712`	`}`
`1711`	`1713`	`else`
`1712`	`1714`	`#endif`
`@@ -1831,6 +1833,7 @@ str_initcap(const char *buff, size_t nbytes, Oid collid)`
`1831`	`1833`	`&buff_conv,buff_uchar,len_uchar);`
`1832`	`1834`	`icu_from_uchar(&result,buff_conv,len_conv);`
`1833`	`1835`	`pfree(buff_uchar);`
	`1836`	`+pfree(buff_conv);`
`1834`	`1837`	`}`
`1835`	`1838`	`else`
`1836`	`1839`	`#endif`

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Commit3a54eb1

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`‎src/backend/utils/adt/formatting.c`

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