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libsec: fix probably_prime() endless loop for n == 3

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

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

@@ -21,10 +21,10 @@

 		nrep = 18;

 	k = mptoi(n);

-	if(k == 2)		/* 2 is prime */

-		return 1;

 	if(k < 2)		/* 1 is not prime */

 		return 0;

+	if(k == 2 || k == 3)	/* 2, 3 is prime */

+		return 1;

 	if((n->p[0] & 1) == 0)	/* even is not prime */

 		return 0;