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/DataFormatters/StringPrinter.cpp b/lldb/source/DataFormatters/StringPrinter.cpp
index 89d7a95..6a000f0 100644
--- a/lldb/source/DataFormatters/StringPrinter.cpp
+++ b/lldb/source/DataFormatters/StringPrinter.cpp
@@ -312,7 +312,7 @@
       utf8_data_end_ptr = utf8_data_ptr + utf8_data_buffer_sp->GetByteSize();
       ConvertFunction(&data_ptr, data_end_ptr, &utf8_data_ptr,
                       utf8_data_end_ptr, llvm::lenientConversion);
-      if (false == zero_is_terminator)
+      if (!zero_is_terminator)
         utf8_data_end_ptr = utf8_data_ptr;
       // needed because the ConvertFunction will change the value of the
       // data_ptr.