CID 1508974: Unchecked return value

[maskit]

 55    /* This is no reason for not grabbing the lock.
 56       So skip the routine which handle LockTry failure case. */
   	
CID 1508974 (#1 of 1): Unchecked return value (CHECKED_RETURN)
2. check_return: Calling TSMutexLockTry without checking return value (as is done elsewhere 6 out of 7 times).
 57    TSMutexLockTry(pmutex); // TODO: why should it not check if we got the lock??
 58    TSContCall(txn_sm, 0, NULL);
 59    TSMutexUnlock(pmutex);
 60    break;