Fix more -Wsign-compare bugs with GCC 4.9.2.

test/unittests/compiler/common-operator-unittest.cc

Index: test/unittests/compiler/common-operator-unittest.cc
diff --git a/test/unittests/compiler/common-operator-unittest.cc b/test/unittests/compiler/common-operator-unittest.cc
index 45bb9533d05652a2b58dd7608205bb63771460ce..2d1e0dcc30694b5e0bf84b4533ae0fc38a6d5d3b 100644
--- a/test/unittests/compiler/common-operator-unittest.cc
+++ b/test/unittests/compiler/common-operator-unittest.cc
@@ -190,8 +190,9 @@ TEST_F(CommonOperatorTest, End) {
     EXPECT_EQ(Operator::kKontrol, op->properties());
     EXPECT_EQ(0, op->ValueInputCount());
     EXPECT_EQ(0, op->EffectInputCount());
-    EXPECT_EQ(input_count, op->ControlInputCount());
-    EXPECT_EQ(input_count, OperatorProperties::GetTotalInputCount(op));
+    EXPECT_EQ(input_count, static_cast<uint32_t>(op->ControlInputCount()));
+    EXPECT_EQ(input_count, static_cast<uint32_t>(
+                               OperatorProperties::GetTotalInputCount(op)));
     EXPECT_EQ(0, op->ValueOutputCount());
     EXPECT_EQ(0, op->EffectOutputCount());
     EXPECT_EQ(0, op->ControlOutputCount());