genksyms: remove useless case DOTS

This switch statement does not list out all the cases. Since the
'default' covers all the rest, the 'DOTS' case is unneeded.
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>

scripts/genksyms/lex.l

@@ -234,7 +234,6 @@ repeat:
 	  lexstate = ST_EXPRESSION;
 	  break;
 
-	case DOTS:
 	default:
 	  APP;
 	  break;