[XFS] replace "extern inline" with "static inline" Patch from Adrian Bunk

<bunk@stusta.de>, thanks a lot!

SGI-PV: 942227
SGI-Modid: xfs-linux:xfs-kern:198642a
Signed-off-by: NChristoph Hellwig <hch@sgi.com>
Signed-off-by: NNathan Scott <nathans@sgi.com>

fs/xfs/linux-2.6/xfs_buf.h

@@ -444,7 +444,7 @@ extern void pagebuf_trace(
 
 #define XFS_BUF_PTR(bp)		(xfs_caddr_t)((bp)->pb_addr)
 
-extern inline xfs_caddr_t xfs_buf_offset(xfs_buf_t *bp, size_t offset)
+static inline xfs_caddr_t xfs_buf_offset(xfs_buf_t *bp, size_t offset)
 {
 	if (bp->pb_flags & PBF_MAPPED)
 		return XFS_BUF_PTR(bp) + offset;