[SCSI] zfcp: Fix linebreak in hba trace

Advance the correct pointer when inserting the linebreak for the HBA
trace. It was missing in the output since the pointer to the output
buffer was never advanced, and the linebreak character was overwritten
later.

Reviewed-by: Swen Schillig <swen@vnet.ibm.com>
Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>