wan: framer: pef2256: use %pe in print format

New cocci check complains:

  drivers/net/wan/framer/pef2256/pef2256.c:733:3-10: WARNING: Consider using %pe to print PTR_ERR()

Link: https://lore.kernel.org/1758192227-701925-1-git-send-email-tariqt@nvidia.com


Acked-by: Herve Codina <herve.codina@bootlin.com>
Link: https://patch.msgid.link/20250918134637.2226614-1-kuba@kernel.org


Signed-off-by: Jakub Kicinski <kuba@kernel.org>