kconfig: truncate too long menu lines in menuconfig

menu lines wrapped over too lines when too long - truncate them.
Also fixed a coding style issue

Signed-off-by: Sam Ravnborg <[e-mail]>

scripts/lxdialog/menubox.c

···
 	int j;
 	char *menu_item = malloc(menu_width + 1);
 
-	strncpy(menu_item, item, menu_width);
+	strncpy(menu_item, item, menu_width - ITEM_IDENT);
 	menu_item[menu_width] = 0;
 	j = first_alpha(menu_item, "YyNnMmHh");
 
···
                 const char *const *items)
 {
 	int i, j, x, y, box_x, box_y;
-	int key = 0, button = 0, scroll = 0, choice = 0, first_item =
-	    0, max_choice;
+	int key = 0, button = 0, scroll = 0, choice = 0;
+	int first_item =  0, max_choice;
 	WINDOW *dialog, *menu;
 	FILE *f;