Update src/description.cpp

Co-authored-by: Paul-Louis Ageneau <[email protected]>

src/description.cpp

@@ -222,7 +222,7 @@ void Description::setFingerprint(CertificateFingerprint f) {
 
 	std::transform(f.value.begin(), f.value.end(), f.value.begin(),
 	               [](char c) { return char(std::toupper(c)); });
-	mFingerprint = f;
+	mFingerprint = std::move(f);
 }
 
 void Description::addIceOption(string option) {