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Fix set attr size

This patch corrects a bug found by cthon special truncate test
on the PT 4.1 branch.  The code rebased for 4.1 needed to add
truncate to the set attr routine, but it was passing a length of
0.  We need to pass wanted attr filesize instead

Signed-off-by: Allison Henderson <achender@linux.vnet.ibm.com>
Merge branch 'tp/jbongio_ibm_next_pt_log_4.1' into ibm_next_ptv4.1_tmp