LXC: fix memory leak in lxcContainerSetupExtraMounts

kill the "return 0;" code, it will cause memory leak.
Signed-off-by: NGao feng <gaofeng@cn.fujitsu.com>

src/lxc/lxc_container.c

@@ -1425,7 +1425,6 @@ static int lxcContainerSetupExtraMounts(virDomainDefPtr vmDef,
         goto cleanup;
 
     VIR_DEBUG("Mounting completed");
-    return 0;
 
     ret = 0;