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devfs: only set configed flag if config was read successfully

this is just to retry reading the configuration at least once after an error

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

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

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

 	/* only read config file once */

 	if (configed)

 		return;

-	configed = 1;

 	dprint("rdconf\n");

 	/* add the std "fs" tree */

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

 			e++;

 		mconfig(p, e - p);

 	}

+	configed = 1;

 	poperror();

 	free(c);