kconfig: some small fixes

- fix a typo in documentation
- fix a typo in a printk on error
- fix comments in dialog_inputbox()

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Signed-off-by: Michal Marek <mmarek@suse.cz>
diff --git a/scripts/kconfig/menu.c b/scripts/kconfig/menu.c
index 21bfb3d..62e3f15 100644
--- a/scripts/kconfig/menu.c
+++ b/scripts/kconfig/menu.c
@@ -197,7 +197,7 @@
 			if ((sym->type == S_STRING || sym->type == S_INT || sym->type == S_HEX) &&
 			    prop->expr->type != E_SYMBOL)
 				prop_warn(prop,
-				    "default for config symbol '%'"
+				    "default for config symbol '%s'"
 				    " must be a single symbol", sym->name);
 			break;
 		case P_SELECT: