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While performing udev sync semaphore's inc/dec operation, we use the result from GETVAL semctl just to print a debug message with current value of that sempahore, nothing else. If the GETVAL fails for whetever reason while the actual inc/dec completes successfully, just log a warning message about the GETVAL (and print the debug messages without the actual semaphore value) and return success for the inc/dec operation as a whole.