Correct alu_dut to alu_inst

verilog/rtl/cpu_core.v

diff --git a/verilog/rtl/cpu_core.v b/verilog/rtl/cpu_core.v
index 912b50d..908c959 100644
--- a/verilog/rtl/cpu_core.v
+++ b/verilog/rtl/cpu_core.v
@@ -196,7 +196,7 @@
 
 alu #(
    .DATA_WIDTH(DATA_WIDTH)
-) alu_dut (
+) alu_inst (
    .opcode(op_alu),
    .in1(in1),
    .in2(in2),