lzo: fix memory leak

the opened file is not being closed during test, which will result
in memory leak.

https://bugzilla.gnome.org/show_bug.cgi?id=751306

gst/matroska/lzo.c

@@ -286,6 +286,8 @@ main (int argc, char *argv[])
     av_log (NULL, AV_LOG_ERROR, "decompression incorrect\n");
   else
     av_log (NULL, AV_LOG_ERROR, "decompression ok\n");
+
+  fclose (in);
   return 0;
 }
 #endif