tools: drop extraneous return statemen

Signed-off-by: Patrick Venture <venture@google.com>
Change-Id: I2a12b61b63ec1e0d54fffae07431c145b988ad7f
diff --git a/tools/updater.cpp b/tools/updater.cpp
index 7c78765..975ee0f 100644
--- a/tools/updater.cpp
+++ b/tools/updater.cpp
@@ -264,8 +264,6 @@
      * benefit from a diagram.
      */
     blob->closeBlob(session);
-
-    return;
 }
 
 } // namespace host_tool