mm: add end_buffer_read helper function
Move duplicated code from end_buffer_read_XXX methods to separate helper function. Signed-off-by: NDmitry Monakhov <dmonakhov@openvz.org> Cc: Nick Piggin <nickpiggin@yahoo.com.au> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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