Remove an "else" that snuck in after a "return" ;)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@158844 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Support/MemoryBuffer.cpp b/lib/Support/MemoryBuffer.cpp
index fabf140..3737706 100644
--- a/lib/Support/MemoryBuffer.cpp
+++ b/lib/Support/MemoryBuffer.cpp
@@ -220,7 +220,7 @@
   error_code err = sys::fs::is_directory(Filename, is_dir);
   if (err)
     return err;
-  else if (is_dir)
+  if (is_dir)
     return make_error_code(errc::is_a_directory);
 
   int OpenFlags = O_RDONLY;