common: add possibility for readline_into_buffer timeout

add possibility to add a timeout when reading a line
into a buffer.

Signed-off-by: Heiko Schocher <hs@denx.de>
Cc: Mike Frysinger <vapier@gentoo.org>
Acked-by: Mike Frysinger <vapier@gentoo.org>
diff --git a/common/menu.c b/common/menu.c
index 5e0817c..3b1e0d0 100644
--- a/common/menu.c
+++ b/common/menu.c
@@ -222,7 +222,8 @@
 
 		menu_display(m);
 
-		readret = readline_into_buffer("Enter choice: ", cbuf);
+		readret = readline_into_buffer("Enter choice: ", cbuf,
+				m->timeout);
 
 		if (readret >= 0) {
 			choice_item = menu_item_by_key(m, cbuf);