octeon_ep: Fix a memory leak in the error handling path of octep_request_irqs()

'oct->non_ioq_irq_names' is not freed in the error handling path of
octep_request_irqs().

Add the missing kfree().

Fixes: 37d79d05

 ("octeon_ep: add Tx/Rx processing and interrupt support")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Acked-by: Veerasenareddy Burru <vburru@marvell.com>
Reviewed-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>