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vtomp: fix another UB

--- a/3rd/mp/mptov.c

+++ b/3rd/mp/mptov.c

@@ -13,12 +13,17 @@

 	int s;

 	uint64_t uv;

-	if(b == nil){

+	if(b == nil)

 		b = mpnew(VLDIGITS*Dbits);

-	}else

+	else

 		mpbits(b, VLDIGITS*Dbits);

-	b->sign = (v >> (sizeof(v)*8 - 1)) | 1;

-	uv = v * b->sign;

+	if(v == INT64_MIN){

+		b->sign = -1;

+		uv = (mpdigit)INT64_MAX+1;

+	}else{

+		b->sign = (v >> (sizeof(v)*8 - 1)) | 1;

+		uv = v * b->sign;

+	}

 	for(s = 0; s < VLDIGITS; s++){

 		b->p[s] = uv;

 #ifndef BITS64