c-parser.c replace error() by error_at()

[Marek Polacek]

On Wed, Feb 19, 2014 at 06:02:23PM +0000, Joseph S. Myers wrote:
> On Wed, 19 Feb 2014, Prathamesh Kulkarni wrote:
> 
> > I have sent it attached this time.
> 
> Thanks, this version is OK.  Please start the copyright assignment 
> paperwork process if you haven't already done so, if you may be 
> contributing more changes in future.
> 
> http://git.savannah.gnu.org/cgit/gnulib.git/plain/doc/Copyright/request-assign.future

I'll commit the latest version shortly.

	Marek