[PATCH] reiserfs pinned buffer fix

[PATCH] reiserfs pinned buffer fix

From: Oleg Drokin <green@linuxhacker.ru>

reiserfs shouldn't be holding a ref against a buffer when running
set_blocksize(): it means that truncate_inode_pages() cannot free that page.

Which is not fatal - the page will drift aimlessly down the LRU until the VM
nails it.   But it's better this way.