recovery: ui changes for ev_*() switch to epoll

Convert callback events parameter to unsigned int.

Change-Id: Ife0e983f307c07bf4aca807d70574aeb20c460cd
diff --git a/ui.h b/ui.h
index d85fc65..22f3e5c 100644
--- a/ui.h
+++ b/ui.h
@@ -134,7 +134,7 @@
     pthread_t input_t;
 
     static void* input_thread(void* cookie);
-    static int input_callback(int fd, short revents, void* data);
+    static int input_callback(int fd, unsigned int epevents, void* data);
     void process_key(int key_code, int updown);
     bool usb_connected();