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libsec: fix operator precedence bugs (thanks kemal)

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

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

@@ -660,7 +660,7 @@

 			goto Short;

 		switch(get16(p-4)){

 		case Extec:

-			if(n < 4 || n & 1 || get16(p) != (n -= 2))

+			if(n < 4 || n % 2 || get16(p) != (n -= 2))

 				goto Short;

 			p += 2;

 			for(i = 0; i < nelem(namedcurves) && c->sec->nc == nil; i++)

@@ -1574,7 +1574,7 @@

 		nn = get16(p);

 		p += 2, n -= 2;

-		if((nn & 1) || n < nn || nn < 2)

+		if(nn % 2 || n < nn || nn < 2)

 			goto Short;

 		m->u.clientHello.ciphers = newints(nn >> 1);

 		for(i = 0; i < nn; i += 2)

@@ -1663,7 +1663,7 @@

 				goto Short;

 			nn = get16(p);

 			p += 2, n -= 2;

-			if(nn & 1)

+			if(nn % 2)

 				goto Short;

 			m->u.certificateRequest.sigalgs = newints(nn>>1);

 			for(i = 0; i < nn; i += 2)

-- 

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