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.cpp b/log_manager.cpp
index 8fca0a9..90cf1d4 100644
--- a/log_manager.cpp
+++ b/log_manager.cpp
@@ -437,7 +437,7 @@
     }
 }
 
-void Manager::processMetadata(const std::string& errorName,
+void Manager::processMetadata(const std::string& /*errorName*/,
                               const std::vector<std::string>& additionalData,
                               AssociationList& objects) const
 {
@@ -709,6 +709,7 @@
         struct pollfd fds = {
             .fd = fd,
             .events = POLLIN,
+            .revents = 0,
         };
         constexpr auto pollTimeout = 5; // 5 seconds
         rc = poll(&fds, 1, pollTimeout * 1000);