git: kernel - Fix bug in recent swap/paging work

[Matthew Dillon]

    It looks like there are still issues with the swap_burst_read
    feature.  I am definitely seeing corruption with it on (after
    I removed the break statement and fixed the logic in one of the
    other tests).  I have to run exhaustive tests to determine
    if the corruption goes away after turning it off first, and
    if so I'll then be able to focus on why it is occuring with
    the feature turned on.

    I'm not sure what I am missing, it should be ok to read multiple
    missing swap-backed pages for a VM object with the tests I'm making.

					-Matt