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[as] Fix string and iden parser

After the last changes string() didn't parsed the full string
and iden would consume the full input string.

--- a/as/expr.c

+++ b/as/expr.c

@@ -195,10 +195,11 @@

 		case '$':

 			continue;

 		default:

-			break;

+			goto out_loop;

 		}

 	}

+out_loop:

 	tok2str();

 	yylval.sym = lookup(yytext);

@@ -236,8 +237,10 @@

 	int c;

 	char *p;

-	while (*endp != '"')

-		++endp;

+	for (++endp; *endp++ != '"'; )

+		;

+	tok2str();

+

 	return STRING;

 }