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devfs: revert commit 4000

induces a kernel panic under normal circumstances

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

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

@@ -740,6 +740,7 @@

 	/* only read config file once */

 	if (configed)

 		return;

+	configed = 1;

 	dprint("rdconf\n");

 	/* add the std "fs" tree */

@@ -791,7 +792,6 @@

 			e++;

 		mconfig(p, e - p);

 	}

-	configed = 1;

 	poperror();

 	free(c);