v5: add disassembler support for PKTDATACOPY_OPCODE

Test: TH
Change-Id: I6910e0a9633a9e7773e94a77c036405861f42f91
diff --git a/disassembler.c b/disassembler.c
index b3668a1..3b9f105 100644
--- a/disassembler.c
+++ b/disassembler.c
@@ -327,12 +327,10 @@
             } else {
                 print_opcode("dcopy");
             }
-            if (len_field > 0) {
-                uint32_t src_offs = imm;
-                uint32_t copy_len = 0;
-                DECODE_IMM(copy_len, 1);
-                bprintf("%d, %d", src_offs, copy_len);
-            }
+            uint32_t src_offs = imm;
+            uint32_t copy_len = 0;
+            DECODE_IMM(copy_len, 1);
+            bprintf("%d, %d", src_offs, copy_len);
             break;
         }
         // Unknown opcode