bmc: allow configuring the verification output path

Allow configuring the file checked to determine the status of the
asynchronous image verification process.

Signed-off-by: Patrick Venture <venture@google.com>
Change-Id: Ia37ed81cd08fa4ce0313092134c476cc42eb8119
diff --git a/test/firmware_createhandler_unittest.cpp b/test/firmware_createhandler_unittest.cpp
index 65aa6ef..3bee96e 100644
--- a/test/firmware_createhandler_unittest.cpp
+++ b/test/firmware_createhandler_unittest.cpp
@@ -43,7 +43,7 @@
     //        .WillOnce(Return(0));
 
     auto handler = FirmwareBlobHandler::CreateFirmwareBlobHandler(
-        std::move(bus_mock), blobs, data);
+        std::move(bus_mock), blobs, data, "");
 
     //    EXPECT_EQ(handler, nullptr);
     EXPECT_FALSE(handler == nullptr);