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Fix compiler warning in mul_var_short().

Some compilers (e.g., gcc before version 7) mistakenly think "carry"might be used uninitialized.Reported by Tom Lane, per various buildfarm members, e.g. arowana.

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src/backend/utils/adt
- numeric.c

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`‎src/backend/utils/adt/numeric.c`

Lines changed: 1 addition & 2 deletions

Original file line number	Diff line number	Diff line change
`@@ -8969,7 +8969,7 @@ mul_var_short(const NumericVar var1, const NumericVar var2,`
`8969`	`8969`	`intres_ndigits;`
`8970`	`8970`	`NumericDigit*res_buf;`
`8971`	`8971`	`NumericDigit*res_digits;`
`8972`		`-uint32carry;`
	`8972`	`+uint32carry=0;`
`8973`	`8973`	`uint32term;`
`8974`	`8974`
`8975`	`8975`	`/* Check preconditions */`
`@@ -9018,7 +9018,6 @@ mul_var_short(const NumericVar var1, const NumericVar var2,`
`9018`	`9018`	`*res_ndigits = var2ndigits + 1`
`9019`	`9019`	`* ----------`
`9020`	`9020`	`*/`
`9021`		`-carry=0;`
`9022`	`9021`	`for (inti=var2ndigits-1;i >=0;i--)`
`9023`	`9022`	`{`
`9024`	`9023`	`term=PRODSUM1(var1digits,0,var2digits,i)+carry;`

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Commit7cac630

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`‎src/backend/utils/adt/numeric.c`

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