[PATCH] minor i386 timer changes for 2.5.41

[PATCH] minor i386 timer changes for 2.5.41

Here's an additional patch that contains the cleanups I did to John's
timer patches.  It does the following:

	- uses C99 initializers
	- makes the timer list static
	- adds better documentation to the timer function structure
	- makes the timer init function return 0 on success
	- NULL terminates the list of timers to make further patches
	  easier.