scsi: aic7xxx: Fix 'amount_xferred' set but not used issue

scsi: aic7xxx: Fix 'amount_xferred' set but not used issue

'amount_xferred' is used, but only in certain circumstances.  Place
the same stipulations on the defining/allocating of 'amount_xferred'
as is placed when using it.

We've been careful not to change any of the ordering semantics here.

Fixes the following W=1 kernel build warning(s):

 drivers/scsi/aic7xxx/aic79xx_osm.c: In function ‘ahd_done’:
 drivers/scsi/aic7xxx/aic79xx_osm.c:1796:12: warning: variable ‘amount_xferred’ set but not used [-Wunused-but-set-variable]

Link: https://lore.kernel.org/r/20200713080001.128044-24-lee.jones@linaro.org
Cc: Hannes Reinecke <hare@suse.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>