mac: Make do-I-need-to-download-lld check actually work.

Bug: 774209
Change-Id: Ia95ff7b9bb74d4b69067c121d0a95af96331199e
Reviewed-on: https://chromium-review.googlesource.com/723941
Commit-Queue: Nico Weber <thakis@chromium.org>
Reviewed-by: Hans Wennborg <hans@chromium.org>
Cr-Commit-Position: refs/heads/master@{#509549}

tools/clang/scripts/download_lld_mac.py

@@ -24,7 +24,7 @@ def AlreadyUpToDate():
   # lld-link seems to have no flag to query the version; go to ld.lld instead.
   # TODO(thakis): Remove ld.lld workaround if https://llvm.org/PR34955 is fixed.
   lld_rev = subprocess.check_output([LD_LLD_PATH, '--version'])
-  return (re.match(r'LLD.*\(trunk (\d+)\)', lld_rev).group(1) !=
+  return (re.match(r'LLD.*\(trunk (\d+)\)', lld_rev).group(1) ==
              update.CLANG_REVISION)