Fix a warning.

llvm-svn: 341561
diff --git a/llvm/unittests/DebugInfo/PDB/NativeSymbolReuseTest.cpp b/llvm/unittests/DebugInfo/PDB/NativeSymbolReuseTest.cpp
index 8c98f83..8168927 100644
--- a/llvm/unittests/DebugInfo/PDB/NativeSymbolReuseTest.cpp
+++ b/llvm/unittests/DebugInfo/PDB/NativeSymbolReuseTest.cpp
@@ -65,7 +65,7 @@
   {
     auto Compilands = GS->findAllChildren<PDBSymbolCompiland>();
     ASSERT_NE(nullptr, Compilands);
-    ASSERT_EQ(2, Compilands->getChildCount());
+    ASSERT_EQ(2U, Compilands->getChildCount());
     std::vector<SymIndexId> Ids2;
 
     // First try resetting the enumerator, then try destroying the enumerator