xfs: remove the redundant xfs_alloc_log_agf

There are two invocations of xfs_alloc_log_agf in xfs_alloc_put_freelist.
The AGF does not change between the two calls. Although this does not pose
any practical problems, it seems like a small mistake. Therefore, fix it
by removing the first xfs_alloc_log_agf invocation.

Signed-off-by: Long Li <leo.lilong@huawei.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Carlos Maiolino <cem@kernel.org>