gfs2: Remove unused RGRP_RSRV_MINBYTES definition

This definition is only used to define RGRP_RSRV_MINBLKS, with no
benefit over defining RGRP_RSRV_MINBLKS directly.

In addition, instead of forcing RGRP_RSRV_MINBLKS to be of type u32,
cast it to that type where that type is required.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Reviewed-by: Steven Whitehouse <swhiteho@redhat.com>

fs/gfs2/rgrp.c

@@ -1566,7 +1566,7 @@ static void rg_mblk_search(struct gfs2_rgrpd *rgd, struct gfs2_inode *ip,
 		extlen = 1;
 	else {
 		extlen = max_t(u32, atomic_read(&ip->i_sizehint), ap->target);
-		extlen = clamp(extlen, RGRP_RSRV_MINBLKS, free_blocks);
+		extlen = clamp(extlen, (u32)RGRP_RSRV_MINBLKS, free_blocks);
 	}
 	if ((rgd->rd_free_clone < rgd->rd_reserved) || (free_blocks < extlen))
 		return;

fs/gfs2/rgrp.h

@@ -18,8 +18,7 @@
  * By reserving 32 blocks at a time, we can optimize / shortcut how we search
  * through the bitmaps by looking a word at a time.
  */
-#define RGRP_RSRV_MINBYTES 8
-#define RGRP_RSRV_MINBLKS ((u32)(RGRP_RSRV_MINBYTES * GFS2_NBBY))
+#define RGRP_RSRV_MINBLKS 32
 #define RGRP_RSRV_ADDBLKS 64
 
 struct gfs2_rgrpd;