zdtm: Drop memory barrier from file_fown

It's a rudiment which not parsed well by all
gcc versions.
Reported-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Acked-by: Andrew Vagin <avagin@parallels.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

test/zdtm/live/static/file_fown.c

@@ -133,8 +133,6 @@ int main(int argc, char *argv[])
 		exit(1);
 	}
 
-	asm volatile ("" :::);
-
 	fill_pipe_params(shared, pipes);
 
 	if (setresuid(-1, euid, -1)) {