Commits on Jan 8, 2018

1. mixer: reduce noise when commands fail …

   Only print errors once, not twice. Do not print usage information
   unless the command was called with invalid arguments.
   
   Because cobra already print its own errors, don't print them again in
   Execute function, just ensure we get the right exit code. Mixer errors
   will be handled by our code, instead of passing the errors to cobra
   and then later get them back. That way no usage is printed.
   
   Two helper functions were added fail/failf to perform Print+Exit.
   
   Signed-off-by: Caio Marcelo de Oliveira Filho <caio.oliveira@intel.com>

   

   cmarcelo committed Jan 8, 2018
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