dump: Clenaup recently added file-ids code
dump: Clenaup recently added file-ids code

 - drop double file-ids.h inclusion
 - rename fd_id_entry to plain entry, it's
   used just in a couple of lines only, no
   need for complex name

Reported-by: Kir Kolyshkin <c0159612b0ef32139322233232df1a0d189c4b9b@parallels.com>
Signed-off-by: Cyrill Gorcunov <7a1ea01eee6961eb1e372e3508c2670446d086f4@openvz.org>

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