[2124] prefer empty() over size() > 0 (see the previous commit)

src/lib/dns/rdata/generic/sshfp_44.cc

@@ -128,7 +128,7 @@ string
 SSHFP::toText() const {
     return (lexical_cast<string>(static_cast<int>(algorithm_)) +
             " " + lexical_cast<string>(static_cast<int>(fingerprint_type_)) +
-            (fingerprint_.size() > 0 ? " " + encodeHex(fingerprint_) : ""));
+            (fingerprint_.empty() ? "" : " " + encodeHex(fingerprint_)));
 }
 
 int