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libmp: fix mptouv behaviour to match mptoui (sync with 9front)

--- a/libmp/mptouv.c

+++ b/libmp/mptouv.c

@@ -33,11 +33,11 @@

 	uvlong v;

 	int s;

-	if(b->top == 0)

+	if(b->top == 0 || b->sign < 0)

 		return 0LL;

 	if(b->top > VLDIGITS)

-		return MAXVLONG;

+		return -1LL;

 	v = 0ULL;

 	for(s = 0; s < b->top; s++)