main: wire up stats_file variable

Signed-off-by: Robin H. Johnson <robbat2@gentoo.org>

diff -Nuar --exclude '*~' omnisync-1.0.orig/main.c omnisync-1.0/main.c
--- omnisync-1.0.orig/main.c	2009-01-02 01:03:20.000000000 -0800
+++ omnisync-1.0/main.c	2018-06-01 14:39:22.115229735 -0700
@@ -358,6 +358,10 @@
 				version();
 				return 0;
 
+			case 'S':
+				stats_file = optarg;
+				break;
+
 			default:
 				help();
 				return 1;