xfs: remove unused trace event xfs_attr_remove_iter_return

xfs: remove unused trace event xfs_attr_remove_iter_return

When the function xfs_attri_remove_iter was removed, it did not remove the
trace event that it called. As a trace event can take up to 5K of memory for
text and meta data regardless of if it is used or not, remove this unused trace
event.

Fixes: 59782a236b62 ("xfs: remove xfs_attri_remove_iter")
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Carlos Maiolino <cem@kernel.org>