Fix compiler crash on typecheck error in FFI call.

[charlesetc]

Running this build of ponyc on the code I posted in this issue #2114 results in a type error instead of a core dump.

Error:
/home/charles/code/stars/bindings.pony:13:21: can't take the address of a let local
    @glutInit[None](addressof argc, argv)

Is return false all that's needed?

[jemc]

Thank you!

Is return false all that's needed?

Yep, that's the appropriate course of action in this situation.

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Can you also add a regression test to https://github.com/ponylang/ponyc/blob/master/test/libponyc/badpony.cc that includes the test case from #2114?

[charlesetc]

Yep! Thanks 🍏

[jemc]

Thanks for taking care of it!