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mp: fix bug in mplogic.c; update mkfile

--- a/sys/src/libmp/port/mkfile

+++ b/sys/src/libmp/port/mkfile

@@ -38,6 +38,7 @@

 	mptoui\

 	mptov\

 	mptouv\

+	mplogic\

 ALLOFILES=${FILES:%=%.$O}

 # cull things in the per-machine directories from this list

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

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

@@ -138,7 +138,6 @@

 	r->top = DIGITS(n);

 	d = n / Dbits;

 	m = n % Dbits;

-	r->sign = 1;

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

 		c = 1;

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

@@ -162,6 +161,7 @@

 		if(m != 0)

 			r->p[d] = b->p[d] & (1<<m)-1;

 	}

+	r->sign = 1;

 	mpnorm(r);

 }