ieee802154: ca8210: Add missing check for kfifo_alloc() in ca8210_probe()

ieee802154: ca8210: Add missing check for kfifo_alloc() in ca8210_probe()

ca8210_test_interface_init() returns the result of kfifo_alloc(),
which can be non-zero in case of an error. The caller, ca8210_probe(),
should check the return value and do error-handling if it fails.

Fixes: ded845a781a5 ("ieee802154: Add CA8210 IEEE 802.15.4 device driver")
Signed-off-by: Keisuke Nishimura <keisuke.nishimura@inria.fr>
Reviewed-by: Simon Horman <horms@kernel.org>
Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/20241029182712.318271-1-keisuke.nishimura@inria.fr
Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org>