cbuildbot: Fix typos

BUG=none
TEST=none

Change-Id: I4f2d17c47f2e0f850408ce28ce6cbe28dbfd7a59
Reviewed-on: https://chromium-review.googlesource.com/234252
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Gaurav Shah <gauravsh@chromium.org>
Tested-by: Gaurav Shah <gauravsh@chromium.org>
diff --git a/scripts/cbuildbot.py b/scripts/cbuildbot.py
index e30b7c7..c663592 100644
--- a/scripts/cbuildbot.py
+++ b/scripts/cbuildbot.py
@@ -1799,7 +1799,7 @@
 
   if not options.buildroot:
     if options.buildbot:
-      parser.error('Please specify a buildroot with the --buildbot option.')
+      parser.error('Please specify a buildroot with the --buildroot option.')
 
     options.buildroot = _DetermineDefaultBuildRoot(options.sourceroot,
                                                    build_config['internal'])