httprl_cron semaphore query omitted curly braces

Line 138:

db_query("DELETE FROM semaphore WHERE value = 'httprl' AND expire < %f", time() - $fuzz_factor);

gives me watchdog errors because we are using a db prefix. Code should be:

db_query("DELETE FROM {semaphore} WHERE value = 'httprl' AND expire < %f", time() - $fuzz_factor);

in D6.