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libsec: ecgen() and ecdsasign() fix

--- a/sys/src/libsec/port/ecc.c

+++ b/sys/src/libsec/port/ecc.c

@@ -397,10 +397,10 @@

 		p = mallocz(sizeof(*p), 1);

 		if(p == nil)

 			return nil;

+		p->x = mpnew(0);

+		p->y = mpnew(0);

+		p->d = mpnew(0);

 	}

-	p->x = mpnew(0);

-	p->y = mpnew(0);

-	p->d = mpnew(0);

 	for(;;){

 		mprand(mpsignif(dom->n), genrandom, p->d);

 		if(mpcmp(p->d, mpzero) > 0 && mpcmp(p->d, dom->n) < 0)

@@ -418,6 +418,7 @@

 	tmp.x = mpnew(0);

 	tmp.y = mpnew(0);

+	tmp.d = mpnew(0);

 	E = betomp(dig, len, nil);

 	t = mpnew(0);

 	if(mpsignif(dom->n) < 8*len)

@@ -439,6 +440,7 @@

 	mpfree(E);

 	mpfree(tmp.x);

 	mpfree(tmp.y);

+	mpfree(tmp.d);

 }

 int