pg_waldump: Don't call XLogDumpDisplayStats() if -q is specified.

Commit ac44367e introduced this
problem.

Report and fix by Fujii Masao.

Discussion: http://postgr.es/m/d332b8f0-0c72-3cd6-6945-7a86a503662a@oss.nttdata.com

src/bin/pg_waldump/pg_waldump.c

@@ -1098,7 +1098,7 @@ main(int argc, char **argv)
 			break;
 	}
 
-	if (config.stats == true)
+	if (config.stats == true && !config.quiet)
 		XLogDumpDisplayStats(&config, &stats);
 
 	if (errormsg)