Checked for all occurences of 'alloc', which catches gs_alloc_bytes,
gs_alloc_byte_arrray, gs_alloc_struct, cos_dict_alloc, cos_array_alloc,
pdfi_object_alloc, rc_alloc_struct, etc

Also checked for uses of gs_resize_object.

Fixed gsicc_add_cs so that it can return an error if an allocation
fails, and checked the return value where used.

Fixed a few cases of fairly obvious typos checking the wrong pointer
(copy/paste errors)

Fixed some memory leaks on VM error.