ext/socket/socket.c (sock_s_getaddrinfo): add strcmp.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@2774 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ext/socket/socket.c

@@ -2291,7 +2291,7 @@ sock_s_getnameinfo(argc, argv)
 		hints.ai_family = PF_INET;
 	    }
 #ifdef INET6
-	    else if (ap, "AF_INET6") == 0) {
+	    else if (strcmp(ap, "AF_INET6") == 0) {
 		hints.ai_family = PF_INET6;
 	    }
 #endif