gpu: nova-core: gsp: do not unwrap() SGEntry

gpu: nova-core: gsp: do not unwrap() SGEntry

[ Upstream commit f7a33a67c50c92589b046e69b9075b7d28d31f87 ]

Don't use unwrap() to extract an Option<SGEntry>, instead handle the
error condition gracefully.

Fixes: a841614e607c ("gpu: nova-core: firmware: process and prepare the GSP firmware")
Signed-off-by: Danilo Krummrich <dakr@kernel.org>
Reviewed-by: John Hubbard <jhubbard@nvidia.com>
Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Message-ID: <20250926130623.61316-2-dakr@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>