[GFS2] Fix bz 230143, incorrect flushing of rgrps

The below patch fixes a problem where we were not flushing rgrps
correctly. It only occurred in the specific case that a callback was
received for an rgrp which was dirty and when a journal log flush had
not already resulted in the rgrp being flushed anyway. This fixes Red
Hat bz 230143,

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
diff --git a/fs/gfs2/glops.c b/fs/gfs2/glops.c
index 46af553..4221110 100644
--- a/fs/gfs2/glops.c
+++ b/fs/gfs2/glops.c
@@ -459,6 +459,8 @@
 };
 
 const struct gfs2_glock_operations gfs2_rgrp_glops = {
+	.go_xmote_th = meta_go_sync,
+	.go_drop_th = meta_go_sync,
 	.go_inval = meta_go_inval,
 	.go_demote_ok = rgrp_go_demote_ok,
 	.go_lock = rgrp_go_lock,