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libsec: no point in checking for "xn--" marker, just call idn2utf().

--- a/sys/src/libsec/port/x509.c

+++ b/sys/src/libsec/port/x509.c

@@ -141,6 +141,10 @@

 #define CLASS_MASK 0xC0

 #define MAXOBJIDLEN 20

+enum {

+	Domlen = 256,

+};

+

 static int ber_decode(uchar** pp, uchar* pend, Elem* pelem);

 static int tag_decode(uchar** pp, uchar* pend, Tag* ptag, int* pisconstr);

 static int length_decode(uchar** pp, uchar* pend, int* plength);

@@ -2268,8 +2272,7 @@

 		}

 		strncpy(name, subject, i);

 	}

-	if(strncmp(subject+i, "xn--", 4) != 0

-	|| idn2utf(subject+i, name+i, nname-i) < 0){

+	if(idn2utf(subject+i, name+i, nname-i) < 0){

 botch:

 		strncpy(name+i, subject+i, nname-i);

 	}

@@ -2618,7 +2621,7 @@

 static Elem

 mkaltname(char *s)

 {

-	char buf[256], *at;

+	char buf[Domlen], *at;

 	Elem e;

 	int i;

@@ -2734,7 +2737,7 @@

 	Elem eext, ealt, edn;

 	Elist *el, *l;

 	Ints *oid;

-	char *alt, *e, buf[256];

+	char *alt, *e, buf[Domlen];

 	int len;

 	if(name == nil || nname < 1 || ext == nil)