DEVEL15-windows-del-symlink-20071021

DEVEL15-windows-del-symlink-20071021

The cmd.exe "del" command operates by opening a file and then setting
the file disposition to delete on close followed by closing the file.

When the filename is a symlink, the smb_fid_t scp refers to the final
destination object and not the symlink.  In smb_CloseFid() the correct
object would be removed from the directory by name, but the wrong cm_scache_t
would be marked deleted.  This would result in subsequent references to
the target file being considered invalid.

Fix it by looking up the cm_scache_t of the symlink prior to performing
the deletion.

(cherry picked from commit f90153625efee1e5589df5e6b66a1162e07ddbfa)