crypto: cavium - Fix an error handling path in cpt_ucode_load_fw()

[ Upstream commit 572b7cf08403b6c67dfe0dc3e0f2efb42443254f ]

If do_cpt_init() fails, a previous dma_alloc_coherent() call needs to be
undone.

Add the needed dma_free_coherent() before returning.

Fixes: 9e2c7d99 ("crypto: cavium - Add Support for Octeon-tx CPT Engine")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Sasha Levin <sashal@kernel.org>