Fix several memleaks, mostly related to errors handling.

* The frontend calls alpm_trans_prepare(&data), and in case of errors,
receive the missing dependencies / conflicts / etc in the data pointer.
It apparently needs to free this structure totally with :
alpm_list_free_inner(data, free)
alpm_list_free(data)

So I added alpm_list_free_inner(data, free) in
pacman/{sync.c,remove.c,add,c}

* in _alpm_sync_prepare, the deps and asked lists were not freed in case
of errors (unresolvable conflicts).
Besides the code for handling this case was duplicated.

* in _alpm_remove_commit, free was used instead of alpm_list_free for
newfiles.

* newline fix in pacman/sync.c

Signed-off-by: Chantry Xavier <shiningxc@gmail.com>
Signed-off-by: Dan McGee <dan@archlinux.org>

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