scsi: core: remove reference to scsi_show_extd_sense()

In commit 2104551969e8 ("scsi: use per-cpu buffer for formatting sense"),
function scsi_show_extd_sense() was removed, switching use over to
scsi_format_extd_sense().  Remove last reference to scsi_show_extd_sense()
in include/scsi/scsi_dbg.h.

Signed-off-by: John Pittman <jpittman@redhat.com>
Reviewed-by: Bart Van Assche <bart.vanassche@wdc.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

include/scsi/scsi_dbg.h

@@ -11,8 +11,6 @@ struct scsi_sense_hdr;
 extern void scsi_print_command(struct scsi_cmnd *);
 extern size_t __scsi_format_command(char *, size_t,
 				   const unsigned char *, size_t);
-extern void scsi_show_extd_sense(const struct scsi_device *, const char *,
-				 unsigned char, unsigned char);
 extern void scsi_print_sense_hdr(const struct scsi_device *, const char *,
 				 const struct scsi_sense_hdr *);
 extern void scsi_print_sense(const struct scsi_cmnd *);