RedirectingFileSystem::openFileForRead - replace bitwise & with boolean && to fix warning

Seems to be just a typo - now matches other instances which do something similar

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@374995 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed