Attn: Code cleanup based on local CI build output

Modified code based on recommendations from local CI build. Cleaned up
some potential null pointer dereferencing code.

Signed-off-by: Ben Tyner <ben.tyner@ibm.com>
Change-Id: I17fb40b25ce37627627c5112a6be786e2bac7c1f
diff --git a/attn/attn_logging.cpp b/attn/attn_logging.cpp
index d802437..014fc96 100644
--- a/attn/attn_logging.cpp
+++ b/attn/attn_logging.cpp
@@ -68,7 +68,7 @@
                       i_additional, ffdcTuples);
 
         // log the event
-        auto reply = bus.call(method);
+        bus.call_noreply(method);
     }
 }