[SCSI] libfc: fix RPORT_TO_PRIV and PRIV_TO_RPORT() macros.

These macros introduce extra undesirable semicolons that keep
them from being used in expressions, and they don't protect
against being passed an expression.

Add parens and remove the semicolons.
Signed-off-by: Joe Eykholt <jeykholt@cisco.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

include/scsi/libfc.h

@@ -223,9 +223,9 @@ struct fc_rport_libfc_priv {
 };
 
 #define PRIV_TO_RPORT(x)						\
-	(struct fc_rport *)((void *)x - sizeof(struct fc_rport));
+	((struct fc_rport *)((void *)(x) - sizeof(struct fc_rport)))
 #define RPORT_TO_PRIV(x)						\
-	(struct fc_rport_libfc_priv *)((void *)x + sizeof(struct fc_rport));
+	((struct fc_rport_libfc_priv *)((void *)(x) + sizeof(struct fc_rport)))
 
 static inline void fc_rport_set_name(struct fc_rport *rport, u64 wwpn, u64 wwnn)
 {