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itomp: fix INT32_MIN case

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

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

@@ -9,12 +9,16 @@

 mpint*

 itomp(int i, mpint *b)

 {

-	if(b == nil){

+	if(b == nil)

 		b = mpnew(0);

+	if(i == INT32_MIN){

+		b->sign = -1;

+		*b->p = (mpdigit)INT32_MAX+1;

+	}else{

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

+		i *= b->sign;

+		*b->p = i;

 	}

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

-	i *= b->sign;

-	*b->p = i;

 	b->top = 1;

 	return mpnorm(b);

 }