Fix filter on realtime extsize.

Merge of master-melb:xfs-cmds:26875a by kenmcd.

096

@@ -53,7 +53,7 @@ _mkfs_filter()
 {
    tee -a $seq.full | \
    sed \
-	-e 's/extsz=[0-9][0-9]*/extsz=N   /' \
+	-e 's/extsz=[0-9][0-9]*[ ]*/extsz=N, /' \
 	-e 's/blocks=[0-9][0-9]*/blocks=N/' \
 	-e 's/agsize=[0-9][0-9]*/agsize=N/' \
 	-e 's/agcount=[0-9][0-9]*/agcount=N/' \