clean up more pedantic compile warnings

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I84790e29a24c73a65c9770c6836b482386cc0ab7
diff --git a/test/bus/match.cpp b/test/bus/match.cpp
index 2074cde..3fa1647 100644
--- a/test/bus/match.cpp
+++ b/test/bus/match.cpp
@@ -29,7 +29,8 @@
 TEST_F(Match, FunctorIs_sd_bus_message_handler_t)
 {
     bool triggered = false;
-    auto trigger = [](sd_bus_message* m, void* context, sd_bus_error* e) {
+    auto trigger = [](sd_bus_message* /*m*/, void* context,
+                      sd_bus_error* /*e*/) {
         *static_cast<bool*>(context) = true;
         return 0;
     };
@@ -49,7 +50,7 @@
 TEST_F(Match, FunctorIs_LambdaTakingMessage)
 {
     bool triggered = false;
-    auto trigger = [&triggered](sdbusplus::message::message& m) {
+    auto trigger = [&triggered](sdbusplus::message::message& /*m*/) {
         triggered = true;
     };
 
@@ -73,7 +74,7 @@
       public:
         bool triggered = false;
 
-        void callback(sdbusplus::message::message& m)
+        void callback(sdbusplus::message::message& /*m*/)
         {
             triggered = true;
         }