fix compiler warnings

Fix a couple unused-parameter warnings so we can turn the warnings all
the way up.

Change-Id: I36c611da5a10732dbb89e289e42a870c902dd245
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/item_updater_main.cpp b/item_updater_main.cpp
index e5991f3..69ee015 100644
--- a/item_updater_main.cpp
+++ b/item_updater_main.cpp
@@ -15,7 +15,7 @@
 
 #include <system_error>
 
-int main(int argc, char* argv[])
+int main(int, char*[])
 {
     using namespace openpower::software::updater;
     using namespace phosphor::logging;