Every rule other than src_info has their syntax checked when
building the AST. It wasn't considered necessary for src_info rules
because they were expected to always be generated by the parser and
aren't part of the CIL language. But there is no check preventing
them from occurring in a policy and the secilc fuzzer found some bugs
by using src_info rules in a policy. This caused some syntax checking
to be added. Since the parse AST from secil2tree will contain src_info
rules and since the goal is to be able to compile the output of
secil2tree, it makes sense to check the syntax of src_info rules
in the same way that all of the other rules are checked.
Check the syntax of src_info statements in the same way every other
rule is checked.
Signed-off-by: James Carter <jwcart2@gmail.com>
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