[autotest] Typo fix in error message.

Fix a small error message typo, and remove one unnecessary temporary
variable.

TEST=None
BUG=None

Change-Id: I7d31790217b55b675e0fc76ab4576dacfb84202a
Reviewed-on: https://gerrit.chromium.org/gerrit/41085
Commit-Queue: Aviv Keshet <akeshet@chromium.org>
Reviewed-by: Aviv Keshet <akeshet@chromium.org>
Tested-by: Aviv Keshet <akeshet@chromium.org>
diff --git a/scheduler/monitor_db.py b/scheduler/monitor_db.py
index f5a55ad..159e838 100755
--- a/scheduler/monitor_db.py
+++ b/scheduler/monitor_db.py
@@ -118,9 +118,9 @@
         scheduler_config.CONFIG_SECTION, 'enable_scheduler', type=bool)
 
     if not scheduler_enabled:
-        msg = ("Scheduler not enabled, set enable_scheduler to true in the "
-               "global_config's SCHEDULER section to enabled it. Exiting.")
-        logging.error(msg)
+        logging.error("Scheduler not enabled, set enable_scheduler to true in "
+                      "the global_config's SCHEDULER section to enable it. "
+                      "Exiting.")
         sys.exit(1)
 
     global RESULTS_DIR