From: George Anzinger <george@mvista.com>

- Removes C++ comment in favor of C style.

- Removes the special treatment for MIPS SIGEV values.  We only require
  (and error if this fails) that the SIGEV_THREAD_ID value not share bits
  with the other SIGEV values.  Note that mips has yet to define this value
  so when they do...

- Corrects the check for the signal range to be from 1 to SIGRTMAX
  inclusive.

- Adds a check to verify that kmem_cache_alloc() actually returned a timer,
  error if not.

- Fixes a bug in timer_gettime() where the incorrect value was returned if
  a signal was pending on the timer OR the timer was a SIGEV_NONE timer.