Undefined behavior fix. #32
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enum mad_layerhas no variant with a discriminator equal to zero. Thus, using a default-initialized frame in rust causes various problems, including segfaults and inexplicable EOF errors (#31). The solution is to initializeheader->layerto a validenum mad_layervalue.This is something that should probably be fixed upstream, though I have no idea who, if anyone, is responsible for maintaining libmad, so I fixed it here since it only seems to affect Rust usage.