Simplify Boolean expressions

This patch simplifies boolean expressions acorss LLDB. It was generated
using clang-tidy with the following command:

run-clang-tidy.py -checks='-*,readability-simplify-boolean-expr' -format -fix $PWD

Differential revision: https://reviews.llvm.org/D55584

llvm-svn: 349215
diff --git a/lldb/source/Plugins/Language/ObjC/CF.cpp b/lldb/source/Plugins/Language/ObjC/CF.cpp
index 9bb8eea..e3dab5a 100644
--- a/lldb/source/Plugins/Language/ObjC/CF.cpp
+++ b/lldb/source/Plugins/Language/ObjC/CF.cpp
@@ -149,7 +149,7 @@
     }
   }
 
-  if (is_type_ok == false)
+  if (!is_type_ok)
     return false;
 
   Status error;