0 is a valid index for a channel. Using it as the value for the terminating
entry of analog_index_map causes zip_append_analog() to falsely assume that
no channel was found when a packet for a channel with index 0 was received.
This prevents the data for the channel to be added to the sigrok sessio
zip_append_analog() does not free most of the memory it allocates. Address
this by moving all sanity checks that do not rely on anything else at the
beginning of the function before any allocations are done. And then make
sure to properly free all allocated memory on all paths leaving the
function.
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