MemoryBuffer API update.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@121956 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/driver/cc1as_main.cpp b/tools/driver/cc1as_main.cpp
index ec2332c9..2eb9ff9 100644
--- a/tools/driver/cc1as_main.cpp
+++ b/tools/driver/cc1as_main.cpp
@@ -228,13 +228,13 @@
     return false;
   }
 
-  error_code ec;
-  MemoryBuffer *Buffer = MemoryBuffer::getFileOrSTDIN(Opts.InputFile, ec);
-  if (Buffer == 0) {
+  OwningPtr<MemoryBuffer> BufferPtr;
+  if (error_code ec = MemoryBuffer::getFileOrSTDIN(Opts.InputFile, BufferPtr)) {
     Error = ec.message();
     Diags.Report(diag::err_fe_error_reading) << Opts.InputFile;
     return false;
   }
+  MemoryBuffer *Buffer = BufferPtr.take();
 
   SourceMgr SrcMgr;