fs/pipe: Convert to lockdep_cmp_fn

*_lock_nested() is fundamentally broken; lockdep needs to check lock
ordering, but we cannot device a total ordering on an unbounded number
of elements with only a few subclasses.

the replacement is to define lock ordering with a proper comparison
function.

fs/pipe.c was already doing everything correctly otherwise, nothing
much changes here.

Cc: Alexander Viro <[email protected]>
Cc: Christian Brauner <[email protected]>
Cc: Jan Kara <[email protected]>
Signed-off-by: Kent Overstreet <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Reviewed-by: Jan Kara <[email protected]>
Signed-off-by: Christian Brauner <[email protected]>

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