xarray: make xa_alloc_cyclic() return 0 on all success cases

xarray: make xa_alloc_cyclic() return 0 on all success cases

Change xa_alloc_cyclic() to return 0 even on wrap-around.  Do the same for
xa_alloc_cyclic_irq() and xa_alloc_cyclic_bh().

This will prevent any future bug of treating return of 1 as an error:
	int ret = xa_alloc_cyclic(...)
	if (ret) // currently mishandles ret==1
		goto failure;

If there will be someone interested in when wrap-around occurs, there is
still __xa_alloc_cyclic() that behaves as before.  For now there is no
such user.

Link: https://lkml.kernel.org/r/20250320102219.8101-1-przemyslaw.kitszel@intel.com
Signed-off-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>
Suggested-by: Matthew Wilcox <willy@infradead.org>
Link: https://lore.kernel.org/netdev/Z9gUd-5t8b5NX2wE@casper.infradead.org
Cc: Andriy Shevchenko <andriy.shevchenko@intel.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Michal Swiatkowski <michal.swiatkowski@linux.intel.com>
Cc: Przemek Kitszel <przemyslaw.kitszel@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>