examples: Fix else branch.

CID #1127816

examples/sshnetcat.c

@@ -143,13 +143,14 @@ static void select_loop(ssh_session session,ssh_channel channel){
 					if(lus==0){
 						channel_free(channel);
 						channel=channels[0]=NULL;
-					} else
+					} else {
 						ret = write(2, buffer, lus);
 						if (ret < 0) {
 							fprintf(stderr, "Error writing to stderr: %s",
 								strerror(errno));
 							return;
 						}
+                    }
 				}
 			}
 			if(channel && channel_is_closed(channel)){