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Fix integer underflow in shared memory debugging

dsa_dump would print a large negative number instead of zero forsegment bin 0. Fix by explicitly checking for underflow and addspecial case for bin 0. Backpatch to all supported versions.Author: Ian Ilyasov <ianilyasov@outlook.com>Reviewed-by: Robert Haas <robertmhaas@gmail.com>Discussion:https://postgr.es/m/GV1P251MB1004E0D09D117D3CECF9256ECD502@GV1P251MB1004.EURP251.PROD.OUTLOOK.COMBackpatch-through: v12

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src/backend/utils/mmgr
- dsa.c

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`‎src/backend/utils/mmgr/dsa.c`

Lines changed: 7 additions & 3 deletions

Original file line number	Diff line number	Diff line change
`@@ -1093,9 +1093,13 @@ dsa_dump(dsa_area *area)`
`1093`	`1093`	`{`
`1094`	`1094`	`dsa_segment_indexsegment_index;`
`1095`	`1095`
`1096`		`-fprintf(stderr,`
`1097`		`-" segment bin %zu (at least %d contiguous pages free):\n",`
`1098`		`-i,1 << (i-1));`
	`1096`	`+if (i==0)`
	`1097`	`+fprintf(stderr,`
	`1098`	`+" segment bin %zu (no contiguous free pages):\n",i);`
	`1099`	`+else`
	`1100`	`+fprintf(stderr,`
	`1101`	`+" segment bin %zu (at least %d contiguous pages free):\n",`
	`1102`	`+i,1 << (i-1));`
`1099`	`1103`	`segment_index=area->control->segment_bins[i];`
`1100`	`1104`	`while (segment_index!=DSA_SEGMENT_INDEX_NONE)`
`1101`	`1105`	`{`

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Commit217928d

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`‎src/backend/utils/mmgr/dsa.c`

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