[PATCH] Add return value to indicate unsopported cipher

[☎]

Hello.

Right now there's no way for user of osmo_a5(..) to understand if particular cipher
(a5/3 for example) is supported or not.

Attached patch adds simple return value to osmo_a5 to fix that.
Of course I would rather see a5/3 included into mainline but in a meantime this patch
might be useful too :)

-- 
best regards,
Max, http://fairwaves.ru
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