Remove unused variables

mythril/laser/ethereum/instructions.py

@@ -1071,13 +1071,9 @@ class Instruction:
                     )
             else:
                 # Copy from both code and calldata appropriately.
-                environment = global_state.environment
-                concrete_memory_offset = helper.get_concrete_int(memory_offset)
                 concrete_code_offset = helper.get_concrete_int(code_offset)
                 concrete_size = helper.get_concrete_int(size)
 
-                calldata = global_state.environment.calldata
-
                 code_copy_offset = concrete_code_offset
                 code_copy_size = (
                     concrete_size