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cwfs: ignore nvram check error

--- a/sys/src/cmd/cwfs/config.c

+++ b/sys/src/cmd/cwfs/config.c

@@ -919,11 +919,14 @@

 	return 0;

 }

-static void

+static int

 setconfig(char *dev)

 {

-	if (dev != nil && !testconfig(dev))

+	if (dev && !testconfig(dev)){

 		nvrsetconfig(dev);	/* if it fails, it will complain */

+		return 0;

+	}

+	return -1;

 }

 void

@@ -934,14 +937,10 @@

 	char word[Maxword+1], *cp;

 	Filsys *fs;

-	if(nvrcheck() == 0) {

-		setconfig(conf.confdev);

-		if (!conf.configfirst)

-			return;

-	}

+	nvrcheck();

+	if(!setconfig(conf.confdev) && !conf.configfirst)

+		return;

-	/* nvr was bad or invoker requested configuration step */

-	setconfig(conf.confdev);

 	for (;;) {

 		print("config: ");

 		if ((line = Brdline(&bin, '\n')) == nil)