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secstore: don't print errors for dial() and readnvram() when not in verbose mode

when no secstore server has been configured or no nvram is
setup, exit silently with error status.

--- a/sys/src/cmd/auth/secstore/secstore.c

+++ b/sys/src/cmd/auth/secstore/secstore.c

@@ -390,7 +390,8 @@

 	c = emalloc(sizeof(*c));

 	if(pass_nvram){

 		if(readnvram(&nvr, 0) < 0){

-			fprint(2, "secstore: readnvram: %r\n");

+			if(verbose)

+				fprint(2, "secstore: readnvram: %r\n");

 			exits("readnvram failed");

 		}

 		strecpy(c->pass, c->pass+sizeof c->pass, nvr.config);

@@ -417,7 +418,8 @@

 			if((fd = dial(netmkaddr(*dest, "tcp", "5356"), nil, nil, nil)) >= 0)

 				break;

 			if(dest[1] == nil){

-				fprint(2, "secstore: can't dial %s: %r\n", *dest);

+				if(verbose)

+					fprint(2, "secstore: can't dial %s: %r\n", *dest);

 				exits("dial failed");

 			}

 		}