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libsec: have rsagen() always produce postive !dk to avoid confusion

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

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

@@ -39,6 +39,8 @@

 			break;

 		mpadd(mpone, e, e);

 	}

+	if(d->sign < 0)

+		mpadd(phi, d, d);

 	mpfree(t1);

 	mpfree(t2);