Sure-up MemoryBuffer ownership in JSONCompilationDatabase's ctor.

llvm-svn: 215246
diff --git a/clang/lib/Tooling/JSONCompilationDatabase.cpp b/clang/lib/Tooling/JSONCompilationDatabase.cpp
index 088b42a..3b5f7e2 100644
--- a/clang/lib/Tooling/JSONCompilationDatabase.cpp
+++ b/clang/lib/Tooling/JSONCompilationDatabase.cpp
@@ -151,7 +151,7 @@
     return nullptr;
   }
   std::unique_ptr<JSONCompilationDatabase> Database(
-      new JSONCompilationDatabase(DatabaseBuffer->release()));
+      new JSONCompilationDatabase(std::move(*DatabaseBuffer)));
   if (!Database->parse(ErrorMessage))
     return nullptr;
   return Database;
@@ -163,7 +163,7 @@
   std::unique_ptr<llvm::MemoryBuffer> DatabaseBuffer(
       llvm::MemoryBuffer::getMemBuffer(DatabaseString));
   std::unique_ptr<JSONCompilationDatabase> Database(
-      new JSONCompilationDatabase(DatabaseBuffer.release()));
+      new JSONCompilationDatabase(std::move(DatabaseBuffer)));
   if (!Database->parse(ErrorMessage))
     return nullptr;
   return Database;