hwmon: Add helper to tell if a char is invalid in a name
HWMON device names are not allowed to contain "-* \t\n". Add a helper which will return true if passed an invalid character. It can be used to massage a string into a hwmon compatible name by replacing invalid characters with '_'. Signed-off-by: NAndrew Lunn <andrew@lunn.ch> Acked-by: NGuenter Roeck <linux@roeck-us.net> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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