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Fix uninitialized variable access.

--- a/lib/std/fmt.myr

+++ b/lib/std/fmt.myr

@@ -586,15 +586,16 @@

 		sval = -(bits : int64)

 		val = (sval : uint64)

 		isneg = true

+

+		/* if its negative after inverting, we have int64 min */

+		if sval < 0

+			std.sbputs(sb, "-9223372036854775808")

+			-> void

+		;;

 	else

 		val = (bits : uint64)

 		val &= ~0 >> (8*(sizeof(uint64)-sizeof(@a)))

 		isneg = false

-	;;

-	/* if its negative after inverting, we have int64 min */

-	if sval < 0

-		std.sbputs(sb, "-9223372036854775808")

-		-> void

 	;;

 	i = 0