[pdb] Fix some warnings that break -Werror builds.

llvm-svn: 277021
diff --git a/llvm/lib/DebugInfo/PDB/Raw/DbiStreamBuilder.cpp b/llvm/lib/DebugInfo/PDB/Raw/DbiStreamBuilder.cpp
index 6e12822..b68f1dc 100644
--- a/llvm/lib/DebugInfo/PDB/Raw/DbiStreamBuilder.cpp
+++ b/llvm/lib/DebugInfo/PDB/Raw/DbiStreamBuilder.cpp
@@ -198,9 +198,9 @@
   DbiStreamHeader *H = Allocator.Allocate<DbiStreamHeader>();
 
   if (auto EC = generateModiSubstream())
-    return std::move(EC);
+    return EC;
   if (auto EC = generateFileInfoSubstream())
-    return std::move(EC);
+    return EC;
 
   H->VersionHeader = *VerHeader;
   H->VersionSignature = -1;