[PATCH] fix: correct the list item types in transaction error data

[guinux]

fix: correct the list item types in transaction error data

PrepareError::data and CommitError::data each describe one of their lists with the wrong item type. In both cases the matching Drop impl already frees the list with the right type.

CommitData::FileConflict

Declared as AlpmList<'a, &'a Conflict>, while alpm_trans_commit returns a list of alpm_fileconflict_t (and Drop frees it as AlpmListMut<OwnedFileConflict>).

PrepareData::PkgInvalidArch

Declared as AlpmList<'a, &'h Package>, while ALPM_ERR_PKG_INVALID_ARCH produces a list of char * package names (and Drop frees it as AlpmListMut<String>).

PrepareData's 'h parameter existed only for that variant, so with it corrected the enum drops to PrepareData<'a>.

FileConflict::conflicting_target

It reads the target field rather than ctarget, so it returns the package that owns the incoming file rather than the package that already owns the conflicting one.