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kernel: don't tokenize inplace in isaconfig() to make /dev/reboot work

--- a/sys/src/9/pc/devarch.c

+++ b/sys/src/9/pc/devarch.c

@@ -1182,7 +1182,7 @@

 int

 isaconfig(char *class, int ctlrno, ISAConf *isa)

 {

-	char cc[32], *p;

+	char cc[32], *p, *x;

 	int i;

 	snprint(cc, sizeof cc, "%s%d", class, ctlrno);

@@ -1189,6 +1189,10 @@

 	p = getconf(cc);

 	if(p == nil)

 		return 0;

+

+	x = nil;

+	kstrdup(&x, p);

+	p = x;

 	isa->type = "";

 	isa->nopt = tokenize(p, isa->opt, NISAOPT);