js: fix tiny leaks if js_try throws(!)

As it turns out, js_try can throw if it runs out of try-stack
(without/before entering either the try part or the catch part).

If it happens, then C code which does allocation -> try will leak.

In mpv there were two places which do alloc and then try, one of
them as part of the autofree system. On both cases the leak is the
smallest possible (zero allocation) - talloc_new(NULL);

It's very unlikely to trigger - an autofree mpv API should be called
when the try-stack is exactly full, and our next try will throw
(and guaranteed to get caught at an outer level, but with a leak).

Fix that by doing the allocation inside the try block, so that if
try throws before it's entered then nothing got allocated/leaked.

Mujs internal code also has/had similar leaks, which are getting
fixed around this time (July 2021, post mujs 1.1.3).

[1] exhaust the try-stack or call-stack, whichever comes first:
      function kaboom() { try { kaboom() } catch(e) {} }

0 files changed, 0 insertions, 0 deletions