[ignition] Fix more -Wsign-compare warnings.

src/interpreter/bytecode-array-writer.cc

Index: src/interpreter/bytecode-array-writer.cc
diff --git a/src/interpreter/bytecode-array-writer.cc b/src/interpreter/bytecode-array-writer.cc
index 34d90b4372a542e20cd098bcf3563eb1f09b3ed3..dbd725ba966f872ffa09e6d41d8647235a487051 100644
--- a/src/interpreter/bytecode-array-writer.cc
+++ b/src/interpreter/bytecode-array-writer.cc
@@ -273,7 +273,7 @@ void BytecodeArrayWriter::PatchJump(size_t jump_target, size_t jump_location) {
 
 void BytecodeArrayWriter::EmitJump(BytecodeNode* node, BytecodeLabel* label) {
   DCHECK(Bytecodes::IsJump(node->bytecode()));
-  DCHECK_EQ(0, node->operand(0));
+  DCHECK_EQ(0u, node->operand(0));
 
   size_t current_offset = bytecodes()->size();