Revert "Remove --buildbot patch check temporarily for emergency link DVT builds."

This reverts commit c6d212a0989c38829db69f863041fad22764ced4.
This is no longer necessary because link DVT now has its own branch.

Original-Change-Id: I327fcc9cc1785ef728274a1407509bbfb7fe67d6
BUG=chrome-os-partner:12554
TEST=Unit tests pass now.
Change-Id: Id39b1a90ccc952ce22886332d056d6a63442b475
Reviewed-on: https://gerrit.chromium.org/gerrit/30500
Tested-by: David James <davidjames@chromium.org>
Commit-Ready: David James <davidjames@chromium.org>
Reviewed-by: Brian Harring <ferringb@chromium.org>
diff --git a/scripts/cbuildbot.py b/scripts/cbuildbot.py
index 72f0acc..2067366 100644
--- a/scripts/cbuildbot.py
+++ b/scripts/cbuildbot.py
@@ -1029,6 +1029,13 @@
     release_mode_with_patches = (options.buildbot and patches and
                                  not options.debug)
 
+  # When running in release mode, make sure we are running with checked-in code.
+  # We want checked-in cbuildbot/scripts to prevent errors, and we want to build
+  # a release image with checked-in code for CrOS packages.
+  if release_mode_with_patches:
+    cros_build_lib.Die(
+        'Cannot provide patches when running with --buildbot!')
+
   if options.buildbot and options.remote_trybot:
     cros_build_lib.Die(
         '--buildbot and --remote-trybot cannot be used together.')