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

Convert callback events parameter to unsigned int.

Change-Id: Ife0e983f307c07bf4aca807d70574aeb20c460cd
diff --git a/ui.cpp b/ui.cpp
index 5043ee5..08c291d 100644
--- a/ui.cpp
+++ b/ui.cpp
@@ -63,12 +63,12 @@
 }
 
 
-int RecoveryUI::input_callback(int fd, short revents, void* data)
+int RecoveryUI::input_callback(int fd, unsigned int epevents, void* data)
 {
     struct input_event ev;
     int ret;
 
-    ret = ev_get_input(fd, revents, &ev);
+    ret = ev_get_input(fd, epevents, &ev);
     if (ret)
         return -1;