test-nasdaq-itch41: Die if buffer_inflate() fails

Stop execution if buffer_inflate() fails and print out an error message.

Signed-off-by: Pekka Enberg <penberg@kernel.org>
test-nasdaq-itch41: Prettify program name

Use the short version of program name everywhere.

Signed-off-by: Pekka Enberg <penberg@kernel.org>
Fix buffer_inflate() Z_BUF_ERROR handling

The zlib documentation states that:

  [...] Z_BUF_ERROR is not fatal, and inflate() can be called again
  with more input and more output space to continue decompressing.

Signed-off-by: Pekka Enberg <penberg@kernel.org>
Use "processing" for progress indicator

Signed-off-by: Pekka Enberg <penberg@kernel.org>