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ref: 2b7d11ed0ac110049760a34794686a0cd65071d6
parent: 65c444328c354a3620bab5b37ceb157e6fad8f17
author: Quentin Rameau <quinq@fifth.space>
date: Wed May 27 05:52:21 EDT 2020

libc: Fix vfprintf numeric sign convertion

When the value is signed, the signed convertion needs to be used
instead of the "unrelevant" unsigned one.

--- a/src/libc/stdio/vfprintf.c

+++ b/src/libc/stdio/vfprintf.c

@@ -61,7 +61,7 @@

 	if ((flags & UNSIGNED) == 0 && val < 0) {

 		*sign = '-';

-		uval = -uval;

+		uval = -val;

 	}

 	return uval;

 }