cifs: Use help macro to get the header preamble size
It's better to use HEADER_PREAMBLE_SIZE because the unfolded expression too long. No actual functional changes, minor readability improvement. Signed-off-by: NZhang Xiaoxu <zhangxiaoxu5@huawei.com> Reviewed-by: NPaulo Alcantara (SUSE) <pc@cjr.nz> Signed-off-by: NSteve French <stfrench@microsoft.com>
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