This fixes failures of the test_ln_gcc_O2 and other related tests
in the angr test suite.  The patch has been proposed upstream.

Taken form: https://github.com/angr/angr/pull/4443

diff --git a/angr/analyses/reassembler.py b/angr/analyses/reassembler.py
index 7a2399a60..b09b3a8cb 100644
--- a/angr/analyses/reassembler.py
+++ b/angr/analyses/reassembler.py
@@ -730,7 +730,7 @@ class Instruction:
             elif operand.type == capstone.CS_OP_MEM:
                 operand_offsets.append(capstone_instr.disp_offset)
             else:
-                operand_offsets.append(None)
+                operand_offsets.append(0)
 
         if self.addr is not None:
             self._initialize(capstone_instr.operands, operand_offsets)