scsi: BusLogic: Supply __printf(x, y) formatting for blogic_msg()

scsi: BusLogic: Supply __printf(x, y) formatting for blogic_msg()

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

 In file included from drivers/scsi/BusLogic.c:51:
 drivers/scsi/BusLogic.c: In function ‘blogic_msg’:
 drivers/scsi/BusLogic.c:3591:2: warning: function ‘blogic_msg’ might be a candidate for ‘gnu_printf’ format attribute [-Wsuggest-attribute=format]

Link: https://lore.kernel.org/r/20210317091125.2910058-2-lee.jones@linaro.org
Cc: Khalid Aziz <khalid@gonehiking.org>
Cc: "James E.J. Bottomley" <jejb@linux.ibm.com>
Cc: "Martin K. Petersen" <martin.petersen@oracle.com>
Cc: "Leonard N. Zubkoff" <lnz@dandelion.com>
Cc: linux-scsi@vger.kernel.org
Acked-by: Khalid Aziz <khalid@gonehiking.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>