[XFS] Cleanup bdevname conditional code in xfs_buf headers.

SGI Modid: 2.5.x-xfs:slinx:163365a

fs/xfs/pagebuf/page_buf.h

@@ -334,4 +334,7 @@ extern void pagebuf_trace(
 # define pagebuf_trace(pb, id, ptr, ra)	do { } while (0)
 #endif
 
+#define pagebuf_target_name(target)	\
+	({ char __b[BDEVNAME_SIZE]; bdevname((target)->pbr_bdev, __b); __b; })
+
 #endif /* __PAGE_BUF_H__ */

fs/xfs/xfs_buf.h

@@ -192,11 +192,9 @@ extern inline xfs_caddr_t xfs_buf_offset(page_buf_t *bp, size_t offset)
 /* setup the buffer target from a buftarg structure */
 #define XFS_BUF_SET_TARGET(bp, target)	\
 		(bp)->pb_target = (target)
-
 #define XFS_BUF_TARGET(bp)	((bp)->pb_target)
-
 #define XFS_BUFTARG_NAME(target)	\
-	({ char __b[BDEVNAME_SIZE]; bdevname((target->pbr_bdev), __b); __b; })
+		pagebuf_target_name(target)
 
 #define XFS_BUF_SET_VTYPE_REF(bp, type, ref)
 #define XFS_BUF_SET_VTYPE(bp, type)