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/NSException.cpp b/lldb/source/Plugins/Language/ObjC/NSException.cpp
index bb0bcb9..2404ef9 100644
--- a/lldb/source/Plugins/Language/ObjC/NSException.cpp
+++ b/lldb/source/Plugins/Language/ObjC/NSException.cpp
@@ -144,11 +144,8 @@
     m_userinfo_sp.reset();
     m_reserved_sp.reset();
 
-    if (!ExtractFields(m_backend, &m_name_sp, &m_reason_sp, &m_userinfo_sp,
-                       &m_reserved_sp)) {
-      return false;
-    }
-    return true;
+    return ExtractFields(m_backend, &m_name_sp, &m_reason_sp, &m_userinfo_sp,
+                         &m_reserved_sp);
   }
 
   bool MightHaveChildren() override { return true; }