hwmon: (s3c-hwmon) Use a real mutex
The semaphore which protects the ADC is semantically a mutex. Use a real mutex. Signed-off-by: NThomas Gleixner <tglx@linutronix.de> Cc: Ben Dooks <ben-linux@fluff.org> Signed-off-by: NJean Delvare <khali@linux-fr.org>
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