Dear all,

the simplification of the size of an array with a bad decl
should not be successful.  Improve the error recovery for
such a situation.

The patch is nearly obvious.  I therefore intend to commit
it in the next few days unless someone comes up with a
better solution.

Regtested on x86_64-pc-linux-gnu.

The PR is marked as a 12/13 regression.  Will therefore
commit to both.

Thanks,
Harald