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IO.binwrite error perhaps due to missing pattern match on {:ok, data} return?

When I run the basic usage like:

File.read("barcode.jpg") |> Zbar.scan()

I get an error like

** (FunctionClauseError) no function clause matching in IO.binwrite/2
    (elixir 1.10.4) lib/io.ex:275: IO.binwrite(#PID<0.628.0>, {:ok, <<255, 216, 255, 224, 0, 16, 74, 70, 73, 70, 0, 1, 1, 0, 0, 72, 0, 72, 0, 0, 255, 225, 0, 76, 69, 120, 105, 102, 0, 0, 77, 77, 0, 42, 0, 0, 0, 8, 0, 2, 1, 18, 0, 3, 0, 0, 0, 1, ...>>})
    (elixir 1.10.4) lib/file.ex:1417: File.open/3
    (elixir 1.10.4) lib/file.ex:1455: File.open!/3
    (zbar 0.2.1) lib/zbar.ex:38: Zbar.do_scan/2
    (elixir 1.10.4) lib/task/supervised.ex:90: Task.Supervised.invoke_mfa/2
    (elixir 1.10.4) lib/task/supervised.ex:35: Task.Supervised.reply/5
    (stdlib 3.13.1) proc_lib.erl:226: :proc_lib.init_p_do_apply/3

Looking through the recent commits and hypothesizing based on the binwrite error, perhaps the structure that needs to be passed to IO.binwrite should be (pid, symbols) instead of (pid, {:ok, symbols}) which is breaking the code in do_scan's return line 57 of zbar.ex?

Any thoughts appreciated! Thanks

Crash on jpeg with "Premature end of JPEG file"

It crashes if jpeg has "Premature end of JPEG file" and because of Task.async the caller app crashes too

13:43:01.184 [error] Task #PID<0.282.0> started from #PID<0.262.0> terminating
** (MatchError) no match of right hand side value: ["Premature"]
    (zbar) lib/zbar.ex:116: anonymous fn/2 in Zbar.parse_symbol/1
    (elixir) lib/enum.ex:1925: Enum."-reduce/3-lists^foldl/2-0-"/3
    (elixir) lib/enum.ex:1314: Enum."-map/2-lists^map/1-0-"/2
    (zbar) lib/zbar.ex:96: Zbar.format_result/1
    (elixir) lib/task/supervised.ex:89: Task.Supervised.do_apply/2
    (elixir) lib/task/supervised.ex:38: Task.Supervised.reply/5
    (stdlib) proc_lib.erl:249: :proc_lib.init_p_do_apply/3

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