[SCSI] sd: fix compile failure with CONFIG_BLK_DEV_INTEGRITY=n

Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

drivers/scsi/sd.h

@@ -97,7 +97,7 @@ struct sd_dif_tuple {
        __be32 ref_tag;		/* Target LBA or indirect LBA */
 };
 
-#if defined(CONFIG_BLK_DEV_INTEGRITY)
+#ifdef CONFIG_BLK_DEV_INTEGRITY
 
 extern void sd_dif_op(struct scsi_cmnd *, unsigned int, unsigned int, unsigned int);
 extern void sd_dif_config_host(struct scsi_disk *);
@@ -106,10 +106,19 @@ extern void sd_dif_complete(struct scsi_cmnd *, unsigned int);
 
 #else /* CONFIG_BLK_DEV_INTEGRITY */
 
-#define sd_dif_op(a, b, c)			do { } while (0)
-#define sd_dif_config_host(a)			do { } while (0)
-#define sd_dif_prepare(a, b, c)			(0)
-#define sd_dif_complete(a, b)			(0)
+static inline void sd_dif_op(struct scsi_cmnd *cmd, unsigned int a, unsigned int b, unsigned int c)
+{
+}
+static inline void sd_dif_config_host(struct scsi_disk *disk)
+{
+}
+static inline int sd_dif_prepare(struct request *rq, sector_t s, unsigned int a)
+{
+	return 0;
+}
+static inline void sd_dif_complete(struct scsi_cmnd *cmd, unsigned int a)
+{
+}
 
 #endif /* CONFIG_BLK_DEV_INTEGRITY */