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mptrunc: don't write to r->p[r->top]

--- a/sys/src/libmp/port/mplogic.c

+++ b/sys/src/libmp/port/mplogic.c

@@ -141,7 +141,7 @@

 	m = n % Dbits;

 	if(b->sign == -1){

 		c = 1;

-		for(i = 0; i <= r->top; i++){

+		for(i = 0; i < r->top; i++){

 			if(i < b->top)

 				r->p[i] = ~(b->p[i] - c);

 			else