[gas] fix expression crash

[Alan Modra]

On Tue, May 04, 2010 at 03:40:50PM +0100, Nathan Sidwell wrote:
> 2010-05-04  Julian Brown  <julian@codesourcery.com>
> 
> 	* read.c (cons_worker): Detect and reject unexpected string argument.
> 
> 2010-05-04  Nathan Sidwell  <nathan@codesourcery.com>
> 
> 	testsuite/
> 	* gas/all/byte.s: New.
> 	* gas/all/byte.l: New.
> 	* gas/all/byte.d: New.
> 	* gas/all/gas.exp: Add it.

OK.

-- 
Alan Modra
Australia Development Lab, IBM