parasite: don't set ret if it is not going to be read

pie/parasite.c:308:3: warning: Value stored to 'ret' is never read
                ret = -1;
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

pie/parasite.c

@@ -305,7 +305,6 @@ static int parasite_get_proc_fd()
 
 	if (sys_mount("proc", proc_mountpoint, "proc", MS_MGC_VAL, NULL)) {
 		pr_err("mount failed\n");
-		ret = -1;
 		goto out_rmdir;
 	}