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factotum: rsa: use mptober() to get right adjusted result instead of mptobe() and memset()

--- a/sys/src/cmd/auth/factotum/rsa.c

+++ b/sys/src/cmd/auth/factotum/rsa.c

@@ -131,7 +131,7 @@

 	State *s;

 	mpint *m;

 	Keyinfo ki;

-	int len, r;

+	int len;

 	s = fss->ps;

 	switch(fss->phase){

@@ -160,13 +160,9 @@

 		len = (mpsignif(priv->pub.n)+7)/8;

 		if(len > *n)

 			return failure(fss, "signature buffer too short");

-		m = rsadecrypt(priv, s->digest, nil);

-		r = mptobe(m, (uchar*)va, len, nil);

-		if(r < len){

-			memmove((uchar*)va+len-r, va, r);

-			memset(va, 0, len-r);

-		}

 		*n = len;

+		m = rsadecrypt(priv, s->digest, nil);

+		mptober(m, (uchar*)va, len);

 		mpfree(m);

 		fss->phase = Established;

 		return RpcOk;