change of behavior for madvise in 3.9-rc1

[CAI Qian]

Bisecting indicated that this commit,
1998cc048901109a29924380b8e91bc049b32951
mm: make madvise(MADV_WILLNEED) support swap file prefetch

Caused an LTP test failure,
http://goo.gl/1FVPy

madvise02    1  TPASS  :  failed as expected: TEST_ERRNO=EINVAL(22): Invalid argument
madvise02    2  TPASS  :  failed as expected: TEST_ERRNO=EINVAL(22): Invalid argument
madvise02    3  TPASS  :  failed as expected: TEST_ERRNO=EINVAL(22): Invalid argument
madvise02    4  TPASS  :  failed as expected: TEST_ERRNO=ENOMEM(12): Cannot allocate memory
madvise02    5  TFAIL  :  madvise succeeded unexpectedly

While it passed without the above commit
madvise02    1  TPASS  :  failed as expected: TEST_ERRNO=EINVAL(22): Invalid argument
madvise02    2  TPASS  :  failed as expected: TEST_ERRNO=EINVAL(22): Invalid argument
madvise02    3  TPASS  :  failed as expected: TEST_ERRNO=EINVAL(22): Invalid argument
madvise02    4  TPASS  :  failed as expected: TEST_ERRNO=ENOMEM(12): Cannot allocate memory
madvise02    5  TPASS  :  failed as expected: TEST_ERRNO=EBADF(9): Bad file descriptor

CAI Qian
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