Fix some compiler warnings.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121959 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/llvm-dis/llvm-dis.cpp b/tools/llvm-dis/llvm-dis.cpp
index 7a72cec..a12cf8c 100644
--- a/tools/llvm-dis/llvm-dis.cpp
+++ b/tools/llvm-dis/llvm-dis.cpp
@@ -83,11 +83,11 @@
   std::auto_ptr<Module> M;
   OwningPtr<MemoryBuffer> BufferPtr;
 
-  if (ec = MemoryBuffer::getFileOrSTDIN(InputFilename, BufferPtr))
+  if ((ec = MemoryBuffer::getFileOrSTDIN(InputFilename, BufferPtr)))
     ErrorMessage = ec.message();
   else
     M.reset(ParseBitcodeFile(BufferPtr.get(), Context, &ErrorMessage));
-  MemoryBuffer *Buffer = BufferPtr.take();
+  (void) BufferPtr.take();
 
   if (M.get() == 0) {
     errs() << argv[0] << ": ";