jobclient: fix error reporting

gethostbyname() doesn't set errno but h_errno.  Thus, we need to call
herror() instead of perror() to print an appropriate error message.
(Thanks, Björn.)

Change-Id: I8fd4bdd4af41774dd290151c5ad37090d006f423

src/core/efw/JobClient.cc

@@ -19,7 +19,7 @@ JobClient::JobClient(const std::string& server, int port)
 	cout << "JobServer: " << m_server.c_str() << endl;
 
 	if (m_server_ent == NULL) {
-		perror("[Client@gethostbyname()]");
+		herror("[Client@gethostbyname()]");
 		// TODO: Log-level?
 		exit(1);
 	}