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eab62dd699
This commit contains the following improvements in `spi-hdlc-adapter`: - It changes the default syslog log level to `LOG_WARNING`. - It enhances the `--verbose[=num]` option to allow negative values to reduce the log level. Note that this change keeps the behavior backward compatible (it is an add-on). - It updates the `print_help()` and the `README.md` files to document new behavior of `--verbose` option.