Probably fixed already, cannot reproduce:

get_byte() in view.c produces warnings in Valgrind.

src/TODO

@@ -1,8 +1,6 @@
 Before 4.6.0-pre2
 =================
 
-get_byte() in view.c produces warnings in Valgrind.
-
 ncurses 5.2 turns off keypad under heavy load on xterm.  Check if
 anything can be done about it.
 
@@ -18,6 +16,10 @@ Before 4.6.0
 
 Contact all translators to update translations.
 
+Portability testing.
+
+Testing in Valgrind.
+
 
 Before 4.6.1
 ============