[LTP] [PATCH] runtest/syscalls: add sendmsg03

[Li Wang]

On Thu, Mar 26, 2020 at 11:17:27AM +0800, Yang Xu wrote:
> Also, fix a possible warning in cleanup when SAFE_UNSHARE(CLONE_NEWUSER)
> failed on 3.10.0-1049.el7.x86_64. as below:
> 
> sendmsg03.c:43: CONF: unshare(268435456) unsupported: EINVAL (22)
> safe_macros.c:67: WARN: sendmsg03.c:65: close(-1) failed: EBADF (9)
> 
> Signed-off-by: Yang Xu <xuyang2018.jy@cn.fujitsu.com>

Pushed.