lineedit: fix build failure

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/libbb/lineedit.c b/libbb/lineedit.c
index 0d23288..1390ed6 100644
--- a/libbb/lineedit.c
+++ b/libbb/lineedit.c
@@ -1520,8 +1520,10 @@
 		for (i = 0; i < state->max_history-1; i++)
 			state->history[i] = state->history[i+1];
 		/* i == state->max_history-1 */
-		if (ENABLE_FEATURE_EDITING_SAVE_ON_EXIT && state->cnt_history_in_file)
+# if ENABLE_FEATURE_EDITING_SAVE_ON_EXIT
+		if (state->cnt_history_in_file)
 			state->cnt_history_in_file--;
+# endif
 	}
 	/* i <= state->max_history-1 */
 	state->history[i++] = xstrdup(str);