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/Target/StackFrame.cpp b/lldb/source/Target/StackFrame.cpp
index 592eaab..3cea644 100644
--- a/lldb/source/Target/StackFrame.cpp
+++ b/lldb/source/Target/StackFrame.cpp
@@ -1079,9 +1079,9 @@
             m_sc.function->GetAddressRange().GetBaseAddress().GetLoadAddress(
                 exe_ctx.GetTargetPtr());
 
-      if (m_sc.function->GetFrameBaseExpression().Evaluate(
+      if (!m_sc.function->GetFrameBaseExpression().Evaluate(
               &exe_ctx, nullptr, loclist_base_addr, nullptr, nullptr,
-              expr_value, &m_frame_base_error) == false) {
+              expr_value, &m_frame_base_error)) {
         // We should really have an error if evaluate returns, but in case we
         // don't, lets set the error to something at least.
         if (m_frame_base_error.Success())