[NFC] Fixed enum constant in boolean context error

Summary:
/home/xbolva00/LLVM/llvm/tools/lldb/source/Plugins/DynamicLoader/Darwin-Kernel/DynamicLoaderDarwinKernel.cpp:656:59: warning: enum constant in boolean context [-Wint-in-bool-context]
     if (mh.magic == llvm::MachO::MH_CIGAM || llvm::MachO::MH_MAGIC)
                                                           ^~~~~~~~
/home/xbolva00/LLVM/llvm/tools/lldb/source/Plugins/DynamicLoader/Darwin-Kernel/DynamicLoaderDarwinKernel.cpp:658:62: warning: enum constant in boolean context [-Wint-in-bool-context]
     if (mh.magic == llvm::MachO::MH_CIGAM_64 || llvm::MachO::MH_MAGIC_64)

Reviewers: JDevlieghere, teemperor

Reviewed By: teemperor

Subscribers: abidh, lldb-commits

Differential Revision: https://reviews.llvm.org/D51600

llvm-svn: 341340