idmap2: fix clang-tidy warnings [readability-*]

Bug: 120024673
Test: mmm frameworks/base/cmds/idmap2; check output
Change-Id: I1565afac8d34e4347d8c946228d1134211e8b435
diff --git a/cmds/idmap2/tests/XmlTests.cpp b/cmds/idmap2/tests/XmlTests.cpp
index 97ff03e..40758b42 100644
--- a/cmds/idmap2/tests/XmlTests.cpp
+++ b/cmds/idmap2/tests/XmlTests.cpp
@@ -58,11 +58,11 @@
 
   auto attrs = xml->FindTag("c");
   ASSERT_THAT(attrs, NotNull());
-  ASSERT_EQ(attrs->size(), 4u);
+  ASSERT_EQ(attrs->size(), 4U);
   ASSERT_EQ(attrs->at("type_string"), "fortytwo");
   ASSERT_EQ(std::stoi(attrs->at("type_int_dec")), 42);
   ASSERT_EQ(std::stoi(attrs->at("type_int_hex")), 42);
-  ASSERT_NE(std::stoul(attrs->at("type_int_boolean")), 0u);
+  ASSERT_NE(std::stoul(attrs->at("type_int_boolean")), 0U);
 
   auto fail = xml->FindTag("does-not-exist");
   ASSERT_THAT(fail, IsNull());