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page: fix noseek detection for files like /dev/screen

--- a/sys/src/cmd/page.c

+++ b/sys/src/cmd/page.c

@@ -696,7 +696,7 @@

 	p->open = tab[i].open;

 	if(seek(fd, 0, 0) < 0)

 		goto Noseek;

-	if((i = read(fd, buf+n, n)) < 0)

+	if((i = readn(fd, buf+n, n)) < 0)

 		goto Err1;

 	if(i != n || memcmp(buf, buf+n, i)){

 		n += i;

-- 

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