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libsec: fix genprime() to produce normalized result

this fixed bug "assert_failed_m-flags__mpnorm_since_283cc2200e34".

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

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

@@ -17,6 +17,7 @@

 	p->p[p->top-1] &= (x-1);

 	p->p[p->top-1] |= x;

 	p->p[0] |= 1;

+	mpnorm(p);

 	// keep icrementing till it looks prime

 	for(;;){