scsi: core: Fix a compiler warning triggered by the SCSI logging code

This patch fixes the following compiler warning:

In file included from drivers/scsi/scsi_error.c:46:
drivers/scsi/scsi_error.c: In function 'scsi_eh_target_reset':
drivers/scsi/scsi_logging.h:65:81: warning: suggest braces around empty body in an 'if' statement [-Wempty-body]
65 | LOGGING(SCSI_LOG_ERROR_SHIFT, SCSI_LOG_ERROR_BITS, LEVEL,CMD);
| ^

drivers/scsi/scsi_error.c:1562:4: note: in expansion of macro 'SCSI_LOG_ERROR_RECOVERY'
1562 | SCSI_LOG_ERROR_RECOVERY(3,
| ^~~~~~~~~~~~~~~~~~~~~~~

Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Bart Van Assche <[e-mail]>
Signed-off-by: Martin K. Petersen <[e-mail]>

drivers/scsi/scsi_logging.h

···
 } while (0)
 #else
 #define SCSI_LOG_LEVEL(SHIFT, BITS) 0
-#define SCSI_CHECK_LOGGING(SHIFT, BITS, LEVEL, CMD)
+#define SCSI_CHECK_LOGGING(SHIFT, BITS, LEVEL, CMD) do { } while (0)
 #endif /* CONFIG_SCSI_LOGGING */
 
 /*