Fix signed/unsigned comparisons

When built on x86-64, these comparisons trigger a warning.  Fix it by
making these constants have the correct signedness.

Change-Id: I56e0b6e4e14bffbc7e45b8264f78fb51f4116789
Signed-off-by: Ed Tanous <ed@tanous.net>
diff --git a/src/tests/test_Utils.cpp b/src/tests/test_Utils.cpp
index 957a9e9..9f772e0 100644
--- a/src/tests/test_Utils.cpp
+++ b/src/tests/test_Utils.cpp
@@ -230,8 +230,8 @@
 
     auto ret = getDeviceBusAddr(devName, bus, provisionedId);
     EXPECT_TRUE(ret);
-    EXPECT_EQ(bus, 0);
-    EXPECT_EQ(provisionedId, 0x22400000001);
+    EXPECT_EQ(bus, 0U);
+    EXPECT_EQ(provisionedId, 0x22400000001U);
 }
 
 TEST(GetDeviceBusAddrTest, AllValid)
@@ -242,6 +242,6 @@
 
     auto ret = getDeviceBusAddr(devName, bus, addr);
     EXPECT_TRUE(ret);
-    EXPECT_EQ(bus, 12);
-    EXPECT_EQ(addr, 0xaf);
+    EXPECT_EQ(bus, 12U);
+    EXPECT_EQ(addr, 0xafU);
 }