Fix socket leak in msc_status_engine_mac_address

One of the paths didn't close the socket.

Author: amezin

apache2/msc_status_engine.c

@@ -225,6 +225,7 @@ int DSOLOCAL msc_status_engine_mac_address (unsigned char *mac)
                 (unsigned char)ifr->ifr_addr.sa_data[4],
                 (unsigned char)ifr->ifr_addr.sa_data[5]);
 
+            close( sock );
             goto end;
         }
     }