accel/habanalabs: fix bug in free scratchpad memory

This commit fixes a bug in Gaudi2 when freeing the scratchpad memory
in case software init fails.

Signed-off-by: Moti Haimovski <mhaimovski@habana.ai>
Reviewed-by: Oded Gabbay <ogabbay@kernel.org>
Signed-off-by: Oded Gabbay <ogabbay@kernel.org>