remove some GNUisms. by Dan Fandrich (dan AT coneharvesters.com)

function                                             old     new   delta
logdirs_reopen                                      1310    1308      -2
read_line_input                                     4757    4753      -4
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 0/2 up/down: 0/-6)               Total: -6 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/libbb/lineedit.c b/libbb/lineedit.c
index 9a773b4..38c69c6 100644
--- a/libbb/lineedit.c
+++ b/libbb/lineedit.c
@@ -2037,7 +2037,8 @@
  rewrite_line:
 			/* Rewrite the line with the selected history item */
 			/* change command */
-			command_len = load_string(state->history[state->cur_history] ? : "", maxsize);
+			command_len = load_string(state->history[state->cur_history] ?
+					state->history[state->cur_history] : "", maxsize);
 			/* redraw and go to eol (bol, in vi) */
 			redraw(cmdedit_y, (state->flags & VI_MODE) ? 9999 : 0);
 			break;