Fix kvz_image_list_add for zero-sized lists.
Fix kvz_image_list_add for zero-sized lists.

When a list does not have space for the new element, its size is
doubled. If the size of the list is zero, it would not be resized. Fixed
to always resize the list so that the new element can be added.

ultravideo/kvazaar,ultravideo/kvazaar,ultravideo/kvazaar,ultravideo/kvazaar,ultravideo/kvazaar