cifs: style: replace one-element array with flexible-array
There is a regular need in the kernel to provide a way to declare
having a dynamically sized set of trailing elements in a structure.
Kernel code should always use "flexible array members"[1] for these
cases. The older style of one-element or zero-length arrays should
no longer be used[2].
Signed-off-by: YANG LI <abaci-bugfix@linux.alibaba.com> Reported-by: Abaci <abaci@linux.alibaba.com> Signed-off-by: Steve French <stfrench@microsoft.com>