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The variable @args is fed to a tracepoint, and that's the only place
it's used.  This is fine for the kernel, but for userspace, tracepoints
are #define'd out of existence, which results in this warning on gcc
11.2:

xfs_attr.c: In function ‘xfs_attr_node_try_addname’:
xfs_attr.c:1440:42: warning: unused variable ‘args’ [-Wunused-variable]
 1440 |         struct xfs_da_args              *args = attr->xattri_da_args;
      |                                          ^~~~

Clean this up.
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Allison Henderson <allison.henderson@oracle.com>