blob_handler: remove unused resp

nit warning found while running unit test

Change-Id: I7bdcb9fac4da4e5efae7eaf6262764cb00101e86
Signed-off-by: Brandon Kim <brandonkim@google.com>
diff --git a/src/ipmiblob/blob_handler.cpp b/src/ipmiblob/blob_handler.cpp
index 6adbe89..40c725d 100644
--- a/src/ipmiblob/blob_handler.cpp
+++ b/src/ipmiblob/blob_handler.cpp
@@ -204,7 +204,7 @@
 
     std::copy(bytes.begin(), bytes.end(), std::back_inserter(payload));
 
-    auto resp = sendIpmiPayload(command, payload);
+    sendIpmiPayload(command, payload);
 }
 
 void BlobHandler::writeMeta(std::uint16_t session, std::uint32_t offset,