[GFS2] Remove a cast, tidy gfs2_inode_attr_in

The remains of the changes for Jan Engelhardt's third email. Remove
a cast and tidy up gfs2_inode_attr_in.

Cc: Jan Engelhardt <jengelh@linux01.gwdg.de>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
diff --git a/fs/gfs2/bmap.c b/fs/gfs2/bmap.c
index a97ad74..0f9567f 100644
--- a/fs/gfs2/bmap.c
+++ b/fs/gfs2/bmap.c
@@ -344,7 +344,7 @@
 	unsigned int i;
 
 	for (i = ip->i_di.di_height; i--;)
-		mp->mp_list[i] = (__u16)do_div(b, sdp->sd_inptrs);
+		mp->mp_list[i] = do_div(b, sdp->sd_inptrs);
 
 }