BUG/MINOR: tcp-rules: completely free incorrect TCP rules on error

BUG/MINOR: tcp-rules: completely free incorrect TCP rules on error

When a tcp-request or tcp-response rule fails to parse, we currently
free only the rule without its contents, which makes ASAN complain.
Now that we have a new function for this, let's completely free the
rule. Reg-tests are now completely OK with ASAN. This relies on this
commit:

  MINOR: actions: add new function free_act_rule() to free a single rule

It's probably not needed to backport this since we're on the exit path
anyway.