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process_command returns a negative value in case of error. Make this clear in the "if" statement and fix the strerror argument to flip it to positive. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com> Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>