xfs: cleanup xfs_fsb_to_db

This function isn't a macro anymore, so remove various superflous braces,
and explicit cast that is done implicitly due to the return value, use
a normal if statement instead of trying to squeeze everything together.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Reviewed-by: NDarrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: NDarrick J. Wong <darrick.wong@oracle.com>

fs/xfs/xfs_bmap_util.c

@@ -39,9 +39,9 @@
 xfs_daddr_t
 xfs_fsb_to_db(struct xfs_inode *ip, xfs_fsblock_t fsb)
 {
-	return (XFS_IS_REALTIME_INODE(ip) ? \
-		 (xfs_daddr_t)XFS_FSB_TO_BB((ip)->i_mount, (fsb)) : \
-		 XFS_FSB_TO_DADDR((ip)->i_mount, (fsb)));
+	if (XFS_IS_REALTIME_INODE(ip))
+		return XFS_FSB_TO_BB(ip->i_mount, fsb);
+	return XFS_FSB_TO_DADDR(ip->i_mount, fsb);
 }
 
 /*