fix various warnings

Fix various warnings emitted by -Werror:

    - Unused parameters.
    - Excess semi-colons.
    - Missing initializer.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: Ifcdac2a66f9cc5f7d7e6571e139c0abdb1c86a8d
diff --git a/log_manager_main.cpp b/log_manager_main.cpp
index 42eb982..7302abd 100644
--- a/log_manager_main.cpp
+++ b/log_manager_main.cpp
@@ -8,7 +8,7 @@
 #include <sdbusplus/server/manager.hpp>
 #include <sdeventplus/event.hpp>
 
-int main(int argc, char* argv[])
+int main(int /*argc*/, char* /*argv*/[])
 {
     auto bus = sdbusplus::bus::new_default();
     auto event = sdeventplus::Event::get_default();