Device::unmake is thread safe

Implementation is protected by a mutex, and this note is outdated
per pothosware#111.

Author: kevinmehall

include/SoapySDR/Device.h

@@ -91,9 +91,6 @@ SOAPY_SDR_API SoapySDRDevice *SoapySDRDevice_makeStrArgs(const char *args);
 /*!
  * Unmake or release a device object handle.
  *
- * \note This call is not thread safe. Implementations calling into unmake
- * from multiple threads should protect this call with a mutex.
- *
  * \param device a pointer to a device object
  * \return 0 for success or error code on failure
  */

include/SoapySDR/Device.hpp

@@ -75,9 +75,6 @@ class SOAPY_SDR_API Device
     /*!
      * Unmake or release a device object handle.
      *
-     * \note This call is not thread safe. Implementations calling into unmake
-     * from multiple threads should protect this call with a mutex.
-     *
      * \param device a pointer to a device object
      */
     static void unmake(Device *device);