* net/tramp.el (top): Remove declarations of `tramp-gw-*' symbols,

* net/tramp.el (top): Remove declarations of `tramp-gw-*' symbols,
they are useless with the byte compiler.
(tramp-make-temp-file, tramp-make-tramp-temp-file): Move up.
(tramp-do-copy-or-rename-file-directly): Rearrange let-bindings.
(tramp-compute-multi-hops): Mask `tramp-gw-*' symbols.
(tramp-file-name-real-host, tramp-file-name-port)
(tramp-find-method, tramp-find-user, tramp-find-host): Make them
defuns.

* net/tramp-cache.el (top): Improve error message when
`tramp-persistency-file-name' is corrupted.