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Fix memory leak in GIN index scans.

The code had a query-lifespan memory leak when encountering GIN entriesthat have posting lists (rather than posting trees, ie, there are arelatively small number of heap tuples containing this index key value).With a suitable data distribution this could add up to a lot of leakage.Problem seems to have been introduced by commit36a35c5, so back-patchto 9.4.Julien Rouhaud

1 parent593f469 commitedd5737Copy full SHA for edd5737

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src/backend/access/gin
- ginget.c

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`‎src/backend/access/gin/ginget.c`

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Original file line number	Diff line number	Diff line change
`@@ -278,6 +278,7 @@ collectMatchBitmap(GinBtreeData btree, GinBtreeStack stack,`
`278`	`278`	`ipd=ginReadTuple(btree->ginstate,scanEntry->attnum,itup,&nipd);`
`279`	`279`	`tbm_add_tuples(scanEntry->matchBitmap,ipd,nipd, false);`
`280`	`280`	`scanEntry->predictNumberResult+=GinGetNPosting(itup);`
	`281`	`+pfree(ipd);`
`281`	`282`	`}`
`282`	`283`
`283`	`284`	`/*`

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Commitedd5737

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`‎src/backend/access/gin/ginget.c`

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