scsi: storvsc: Miscellaneous code cleanups

As general cleanup and in preparation for subsequent patches:

 - Use min() instead of open coding.

 - Use set_host_byte() instead of open coding access to scsi_status
   field.

 - Collapse nested "if" statements to reduce indentation.

 - Fix other indentation.

 - Remove extra blank lines.

No functional changes.

[mkp: dropped status_byte() which no longer exists]

Link: https://lore.kernel.org/r/1622827263-12516-1-git-send-email-mikelley@microsoft.com
Signed-off-by: Michael Kelley <mikelley@microsoft.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>