mpage: some code cleanups

[Hai Shan]

Merged mpage_end_io_read() and mpage_end_io_write() to mpage_end_io(),
because they share three of four codes.

---
 fs/mpage.c |   49 +++++++++++++++++--------------------------------
 1 files changed, 17 insertions(+), 32 deletions(-)

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