[llvm-dwarfdump] - Fix win10 build bot failture.

Bot failed: 
http://lab.llvm.org:8011/builders/llvm-clang-lld-x86_64-scei-ps4-windows10pro-fast/builds/20877/steps/test/logs/stdio

This was broken after the 
r344895 "[llvm-dwarfdump] - Add the support of parsing .debug_loclists."
because of wrong formatting specifiers used.

llvm-svn: 344896