Dear all,

we sometimes silently accept wrong declarations with unbalanced
parentheses, as the PR and testcases therein show.

It appears that the fix is obvious: use the existing error paths in
gfc_match_kind_spec and error return from gfc_match_decl_type_spec.
I'm still posting it here in case I have missed something not so
obvious.

The patch regtests cleanly on x86_64-pc-linux-gnu.  OK for mainline?

Thanks,
Harald