Add bindiff for tests

src/osd/osd_primary_chain.cpp

@@ -369,8 +369,6 @@ std::vector<osd_chain_read_t> osd_t::collect_chained_read_requests(osd_op_t *cur
                 global_bitmap[cur>>3] = global_bitmap[cur>>3] | (part_bitmap[cur>>3] & (1 << (cur&7)));
             }
             // Add request
-            if (cur_op->req.rw.len)
-            {
             chain_reads.push_back((osd_chain_read_t){
                 .chain_pos = chain_pos,
                 .inode = op_data->read_chain[chain_pos],
@@ -379,7 +377,6 @@ std::vector<osd_chain_read_t> osd_t::collect_chained_read_requests(osd_op_t *cur
             });
         }
     }
-    }
     return chain_reads;
 }