[tor-bugs] #4899 [Pluggable transport]: Port #4230 fix to obfsproxy's container.c.

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#4899: Port #4230 fix to obfsproxy's container.c.
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 Reporter:  asn                  |          Owner:  asn
     Type:  defect               |         Status:  new
 Priority:  normal               |      Milestone:     
Component:  Pluggable transport  |        Version:     
 Keywords:                       |         Parent:     
   Points:                       |   Actualpoints:     
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 #4230 was about overflows in `smartlist_ensure_capacity()` of
 `container.c`.

 obfsproxy also uses `container.c` and #4230's fix is not included.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/4899>
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