[Analysis] Un-silence -Wtautological-unsigned-zero-compare in null-deref-ps.c
[Analysis] Un-silence -Wtautological-unsigned-zero-compare in null-deref-ps.c

Stage-2 builds failed:

error: 'warning' diagnostics expected but not seen:
  File /home/buildbot/modules-slave-2/clang-x86_64-linux-selfhost-modules-2/llvm.src/tools/clang/test/Analysis/null-deref-ps.c Line 238: always true

git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@315622 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,apple/swift-clang,apple/swift-clang,llvm-mirror/clang,llvm-mirror/clang,apple/swift-clang,apple/swift-clang,llvm-mirror/clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,llvm-mirror/clang,llvm-mirror/clang,apple/swift-clang,llvm-mirror/clang,apple/swift-clang,apple/swift-clang,llvm-mirror/clang