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kernel: simplify syspipe()

--- a/sys/src/9/port/sysfile.c

+++ b/sys/src/9/port/sysfile.c

@@ -189,10 +189,9 @@

 uintptr

 syspipe(va_list list)

 {

+	static char *datastr[] = {"data", "data1"};

 	int fd[2], *ufd;

 	Chan *c[2];

-	Dev *d;

-	static char *datastr[] = {"data", "data1"};

 	ufd = va_arg(list, int*);

 	validaddr((uintptr)ufd, sizeof(fd), 1);

@@ -199,7 +198,6 @@

 	evenaddr((uintptr)ufd);

 	ufd[0] = ufd[1] = fd[0] = fd[1] = -1;

-	d = devtab[devno('|', 0)];

 	c[0] = namec("#|", Atodir, 0, 0);

 	c[1] = nil;

 	if(waserror()){

@@ -213,8 +211,8 @@

 		error(Egreg);

 	if(walk(&c[1], datastr+1, 1, 1, nil) < 0)

 		error(Egreg);

-	c[0] = d->open(c[0], ORDWR);

-	c[1] = d->open(c[1], ORDWR);

+	c[0] = devtab[c[0]->type]->open(c[0], ORDWR);

+	c[1] = devtab[c[1]->type]->open(c[1], ORDWR);

 	if(newfd2(fd, c) < 0)

 		error(Enofd);

 	ufd[0] = fd[0];