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Avoid formally-undefined use of memcpy() in hstoreUniquePairs().

hstoreUniquePairs() often called memcpy with equal source and destinationpointers. Although this is almost surely harmless in practice, it'sundefined according to the letter of the C standard. Some versions ofvalgrind will complain about it, and some versions of libc as well(cf. commitad520ec). Tweak the code to avoid doing that.Noted by Tomas Vondra. Back-patch to all supported versions becauseof the hazard of libc assertions.Discussion:https://postgr.es/m/bf84d940-90d4-de91-19dd-612e011007f4@fuzzy.cz

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contrib/hstore
- hstore_io.c

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`‎contrib/hstore/hstore_io.c`

Lines changed: 2 additions & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -340,7 +340,8 @@ hstoreUniquePairs(Pairs a, int32 l, int32 buflen)`
`340`	`340`	`{`
`341`	`341`	`*buflen+=res->keylen+ ((res->isnull) ?0 :res->vallen);`
`342`	`342`	`res++;`
`343`		`-memcpy(res,ptr,sizeof(Pairs));`
	`343`	`+if (res!=ptr)`
	`344`	`+memcpy(res,ptr,sizeof(Pairs));`
`344`	`345`	`}`
`345`	`346`
`346`	`347`	`ptr++;`

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`‎contrib/hstore/hstore_io.c`

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