scsi: Fix wrong additional sense length in descriptor format

scsi: Fix wrong additional sense length in descriptor format

The sense header additional sense length should be the accumulated
size of all the descriptors. Information descriptor size is 12 bytes.
When setting the additional sense length we should add 0xc instead of
0xa.

Signed-off-by: Sagi Grimberg <[email protected]>
Reviewed-by: Hannes Reinecke <[email protected]>
Reviewed-by: Martin K. Petersen <[email protected]>
Reviewed-by: Christoph Hellwig <[email protected]>
Signed-off-by: Nicholas Bellinger <[email protected]>