phosphor-ipmi-flash: Fix all C++ warnings

Change-Id: I89236b2dab88ca725e269bb8f5b2cbfd271e807a
Signed-off-by: Willy Tu <wltu@google.com>
diff --git a/bmc/version-handler/version_handler.cpp b/bmc/version-handler/version_handler.cpp
index f2ab881..0efdcf7 100644
--- a/bmc/version-handler/version_handler.cpp
+++ b/bmc/version-handler/version_handler.cpp
@@ -82,12 +82,12 @@
 /**
  * deleteBlob - does nothing, always fails
  */
-bool VersionBlobHandler::deleteBlob(const std::string& path)
+bool VersionBlobHandler::deleteBlob(const std::string&)
 {
     return false;
 }
 
-bool VersionBlobHandler::stat(const std::string& path, blobs::BlobMeta* meta)
+bool VersionBlobHandler::stat(const std::string&, blobs::BlobMeta*)
 {
     return false;
 }