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nlplug-findfs: allow success even if nothing found

add -n option to allow return success even if nothing was found. This is
useful for net boot, where apkovl and repositories are on network.

--- a/nlplug-findfs.c

+++ b/nlplug-findfs.c

@@ -840,6 +840,7 @@

 	int event_count = 0;

 	size_t total_bytes = 0;

 	int found = 0;

+	int not_found_is_ok = 0;

 	char *program_argv[2] = {0,0};

 	pthread_t tid;

 	sigset_t sigchldmask;

@@ -875,6 +876,9 @@

 	case 'm':

 		conf.crypt_name = EARGF(usage(1));

 		break;

+	case 'n':

+		not_found_is_ok = 1;

+		break;

 	case 'd':

 		dodebug = 1;

 		break;

@@ -1017,5 +1021,5 @@

 		conf.fork_count,

 		event_count, total_bytes);

-	return found ? 0 : 1;

+	return found || not_found_is_ok ? 0 : 1;

 }