Fixed some stuff

List of changes in dump.c
* _ol_store_bin_object will now fail if the key is too big (instead of just reporting it, resulting in mallocing an 
integer overflow)
* Fixed an if missing braces, resulting in the second command being executed regardless of the condition
* Removed ol_bucket *item, it was useless and made cppcheck mad.
* Nulled fd at dump.c:122 so it won't trigger the fclose check on error since it was already closed.