Fix build when using different sysroots.

Bug:
Change-Id: I86b4c72343288d83d51f493d3d888aad45baed5a
Reviewed-on: https://pdfium-review.googlesource.com/20610
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
diff --git a/core/fpdfapi/font/cfx_cttgsubtable.cpp b/core/fpdfapi/font/cfx_cttgsubtable.cpp
index 4870756..ae868ca 100644
--- a/core/fpdfapi/font/cfx_cttgsubtable.cpp
+++ b/core/fpdfapi/font/cfx_cttgsubtable.cpp
@@ -243,12 +243,12 @@
   if (format == 1) {
     auto rec = pdfium::MakeUnique<TCoverageFormat1>();
     ParseCoverageFormat1(raw, rec.get());
-    return rec;
+    return std::move(rec);
   }
   if (format == 2) {
     auto rec = pdfium::MakeUnique<TCoverageFormat2>();
     ParseCoverageFormat2(raw, rec.get());
-    return rec;
+    return std::move(rec);
   }
   return nullptr;
 }
diff --git a/core/fpdfdoc/cpdf_action.cpp b/core/fpdfdoc/cpdf_action.cpp
index 9d28bc1..a3e2e23 100644
--- a/core/fpdfdoc/cpdf_action.cpp
+++ b/core/fpdfdoc/cpdf_action.cpp
@@ -21,7 +21,7 @@
 
 }  // namespace
 
-CPDF_Action::CPDF_Action() {}
+CPDF_Action::CPDF_Action() : CPDF_Action(nullptr) {}
 
 CPDF_Action::CPDF_Action(CPDF_Dictionary* pDict) : m_pDict(pDict) {}