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make len==0 return OPUS_INVALID_PACKET rather than OPUS_BAD_ARG for opus_packet_parse_impl()

len<0 still returns OPUS_BAD_ARG

--- a/src/opus.c

+++ b/src/opus.c

@@ -201,8 +201,10 @@

    opus_int32 pad = 0;

    const unsigned char *data0 = data;

-   if (size==NULL || len<1)

+   if (size==NULL || len<0)

       return OPUS_BAD_ARG;

+   if (len==0)

+      return OPUS_INVALID_PACKET;

    framesize = opus_packet_get_samples_per_frame(data, 48000);