recovery: fix epoll events type to uint32_t

Change-Id: I5db9987102201c18821acb45d1f824e9865a1451
diff --git a/ui.cpp b/ui.cpp
index 08c291d..67a2500 100644
--- a/ui.cpp
+++ b/ui.cpp
@@ -63,7 +63,7 @@
 }
 
 
-int RecoveryUI::input_callback(int fd, unsigned int epevents, void* data)
+int RecoveryUI::input_callback(int fd, uint32_t epevents, void* data)
 {
     struct input_event ev;
     int ret;