db/upnp: remove unused method errAsString()

src/db/upnp/upnpplib.cxx

@@ -24,7 +24,6 @@
 #include "Log.hxx"
 
 #include <string>
-#include <sstream>
 #include <map>
 #include <vector>
 #include <set>
@@ -111,14 +110,6 @@ LibUPnP::registerHandler(Upnp_EventType et, Upnp_FunPtr handler, void *cookie)
 		m_handlers.emplace(et, Handler(handler, cookie));
 }
 
-std::string
-LibUPnP::errAsString(const std::string& who, int code)
-{
-	std::ostringstream os;
-	os << who << " :" << code << ": " << UpnpGetErrorMessage(code);
-	return os.str();
-}
-
 int
 LibUPnP::o_callback(Upnp_EventType et, void* evp, void* cookie)
 {

src/db/upnp/upnpplib.hxx

@@ -85,9 +85,6 @@ public:
 	{
 		return m_clh;
 	}
-
-	/** Translate integer error code (UPNP_E_XXX) to string */
-	static std::string errAsString(const std::string& who, int code);
 };
 
 #endif /* _LIBUPNP.H_X_INCLUDED_ */