[linux-cifs-client] Follow up checks for patch "make sure we have the right resume info before calling CIFSFindNext"

[Steve French]

This patch adds some primitive checks to make sure the last_entry does
not go beyond end of buffer.

Should we change the resume key (e.g. to null) if a null resume name
is passed in (server sets this file wrong for example)?



-- 
Thanks,

Steve
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