scsi: esas2r: Supply __printf(x, y) formatting for esas2r_log_master()

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

 drivers/scsi/esas2r/esas2r_log.c: In function ‘esas2r_log_master’:
 drivers/scsi/esas2r/esas2r_log.c:155:3: warning: function ‘esas2r_log_master’ might be a candidate for ‘gnu_printf’ format attribute [-Wsuggest-attribute=format]

Link: https://lore.kernel.org/r/20210312094738.2207817-19-lee.jones@linaro.org
Cc: Bradley Grove <linuxdrivers@attotech.com>
Cc: "James E.J. Bottomley" <jejb@linux.ibm.com>
Cc: "Martin K. Petersen" <martin.petersen@oracle.com>
Cc: linux-scsi@vger.kernel.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/esas2r/esas2r_log.c

@@ -101,6 +101,11 @@ static const char *translate_esas2r_event_level_to_kernel(const long level)
 	}
 }
 
+#pragma GCC diagnostic push
+#ifndef __clang__
+#pragma GCC diagnostic ignored "-Wsuggest-attribute=format"
+#endif
+
 /*
  * the master logging function.  this function will format the message as
  * outlined by the formatting string, the input device information and the
@@ -170,6 +175,8 @@ static int esas2r_log_master(const long level,
 	return 0;
 }
 
+#pragma GCC diagnostic pop
+
 /*
  * formats and logs a message to the system log.
  *