avutil: use EINVAL instead of -1 for the return code of crypto related init functions
These functions return an error typically when the key size is an incorrect number. AVERROR(EINVAL) is more specific than -1. Reviewed-by: NRonald S. Bultje <rsbultje@gmail.com> Reviewed-by: NMichael Niedermayer <michael@niedermayer.cc> Signed-off-by: NGanesh Ajjanagadde <gajjanagadde@gmail.com>
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