Check return code of connect(2).

Signed-off-by: William Orr <will@worrbase.com>
Reviewed-by: Andreas Schneider <asn@cryptomilk.org>

src/connect.c

@@ -382,7 +382,15 @@ socket_t ssh_connect_host_nonblocking(ssh_session session, const char *host,
         continue;
     }
 
-    connect(s, itr->ai_addr, itr->ai_addrlen);
+    rc = connect(s, itr->ai_addr, itr->ai_addrlen);
+    if (rc == -1) {
+      ssh_set_error(session, SSH_FATAL,
+          "Failed to connect: %s", strerror(errno));
+      ssh_connect_socket_close(s);
+      s = -1;
+      continue;
+    }
+
     break;
   }