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9gc: print getaddrinfo error if any

--- a/9gc.c

+++ b/9gc.c

@@ -138,8 +138,10 @@

 		return -1;

 	}

 	port++;

-	if ((e = getaddrinfo(host, port, &hint, &r)) != 0)

+	if ((e = getaddrinfo(host, port, &hint, &r)) != 0){

+		fprintf(stderr, "%s: %s\n", gai_strerror(e), s);

 		return -1;

+	}

 	f = -1;

 	for (a = r; a != NULL; a = a->ai_next) {

 		if ((f = socket(a->ai_family, a->ai_socktype, a->ai_protocol)) < 0)