version-handler: Remove superfluous open session check

The phosphor-ipmi-flash API guarantees that calls to open() will not
happen with duplicate session IDs.

Change-Id: Ife88b2743322387e5cc6ebe2b34567c3d2d2957a
Signed-off-by: William A. Kennington III <wak@google.com>
diff --git a/bmc/version-handler/version_handler.cpp b/bmc/version-handler/version_handler.cpp
index 76de76c..5d66713 100644
--- a/bmc/version-handler/version_handler.cpp
+++ b/bmc/version-handler/version_handler.cpp
@@ -70,13 +70,7 @@
     }
 
     auto& v = *blobInfoMap.at(path);
-    auto [it, emplaced] = sessionToBlob.try_emplace(session, &v);
-    if (!emplaced)
-    {
-        fprintf(stderr, "open %s fail: session number %d assigned to %s\n",
-                path.c_str(), session, it->second->blobId.c_str());
-        return false;
-    }
+    sessionToBlob[session] = &v;
 
     if (v.blobState == blobs::StateFlags::open_read)
     {