Eliminate a "possible unintended assignment" warning.

[originally from svn r3179]

proxy.c

@@ -388,7 +388,8 @@ Socket new_connection(SockAddr addr, char *hostname,
 	Socket sret;
 
 	if ((sret = platform_new_connection(addr, hostname, port, privport,
-					     oobinline, nodelay, plug, cfg)) )
+					    oobinline, nodelay, plug, cfg)) !=
+	    NULL)
 	    return sret;
 
 	ret = snew(struct Socket_proxy_tag);