Remove unnecessary errors printed on the console (#5386)

Some of the errors printed on server console can be
removed as those error message is unnecessary.

Fixes #5385

cmd/web-handlers.go

@@ -560,7 +560,6 @@ func (web *webAPIHandlers) Upload(w http.ResponseWriter, r *http.Request) {
 	// Extract incoming metadata if any.
 	metadata, err := extractMetadataFromHeader(r.Header)
 	if err != nil {
-		errorIf(err, "found invalid http request header")
 		writeErrorResponse(w, ErrInternalError, r.URL)
 		return
 	}