Address review for #105195

Use a `StringRefNull` to store the translation context instead of
passing it through `BLI_strdup()`.

@@ -184,0 +187,4 @@
+  const nodes::SocketDeclaration &socket_decl = *socket.runtime->declaration;
+
+  /* The node is not explicitly defined. */
+  if (&socket_decl == nullptr) {

@@ -184,0 +198,4 @@
+  }
+
+  output << translation_context.data();
+  return BLI_strdup(output.str().c_str());

@@ -184,0 +195,4 @@
+    return nullptr;
+  }
+
+  return BLI_strdup(translation_context.data());