crypto: img-hash - Fix dma_unmap_sg() nents value

[ Upstream commit 34b283636181ce02c52633551f594fec9876bec7 ]

The dma_unmap_sg() functions should be called with the same nents as the
dma_map_sg(), not the value the map function returned.

Fixes: d358f1ab ("crypto: img-hash - Add Imagination Technologies hw hash accelerator")
Signed-off-by: Thomas Fourier <fourier.thomas@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Sasha Levin <sashal@kernel.org>