[PATCH] fix: correct metadata's update communication

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The problem occurs when array under migration is assembled incrementally.
st->update_tail is not initialized in function
assemble_container_content() and during reshape
the checkpoint information in metadata is not being updated.

The value of st->update_tail is now initialized in function
assemble_container_content() and during reshape the checkpoint
information in metadata is being updated correctly on all disks.

Signed-off-by: Lukasz Dorau <lukasz.dorau@xxxxxxxxx>
---
 Assemble.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/Assemble.c b/Assemble.c
index 3c8e74d..74708d1 100644
--- a/Assemble.c
+++ b/Assemble.c
@@ -1585,6 +1585,9 @@ int assemble_container_content(struct supertype *st, int mdfd,
 				if (!mdmon_running(st->container_dev))
 					start_mdmon(st->container_dev);
 				ping_monitor_by_id(st->container_dev);
+				if (mdmon_running(st->container_dev) &&
+						st->update_tail == NULL)
+					st->update_tail = &st->updates;
 			}
 
 			err = Grow_continue(mdfd, st, content, backup_file,

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