ufs_inode_get{frag,block}(): get rid of retries
We are holding ->truncate_mutex, so nobody else can alter our
block pointers. Rechecks/retries were needed back when we
only held BKL there, and had to cope with write_begin/writepage
and writepage/truncate races. Can't happen anymore...
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
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