[master] Clarify comment in SysCatalogTable::WaitUntilRunning().

This change clarifies the comment detailing the return behavior of
the status in SysCatalogTable::WaitUntilRunning().

Change-Id: I6d46d6797d112db8f45c714c3ba49c4b3c3315a7
Reviewed-on: http://gerrit.cloudera.org:8080/17337
Reviewed-by: Andrew Wong <[email protected]>
Tested-by: Andrew Wong <[email protected]>

src/kudu/master/sys_catalog.cc

@@ -541,7 +541,7 @@ Status SysCatalogTable::WaitUntilRunning() {
                                << seconds_waited << " seconds)";
       continue;
     }
-    // if the status is not OK or TimedOut return it.
+    // If the status is not OK or not TimedOut, then return it.
     return status;
   }
   return Status::OK();