systemctl doesn't interpret mdadm-grow-continue@.service
correctly due to the wrong argument provided in [service],
it should be corrected %I as %i. Otherwise, if the service
cannot start by systemctl and the reshap progress would be
stuck all time when grows array from raid1 to raid5.

reproduce steps:
./mdadm -CR /dev/md0 -l1 -b internal -n2 /dev/loop[0-1]
./mdadm --grow /dev/md0 -l5 -n3 -a /dev/loop2

Signed-off-by: Zhilong Liu <redacted>
---
 systemd/mdadm-grow-continue@.service | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/systemd/mdadm-grow-continue@.service b/systemd/mdadm-grow-continue@.service
index 5c667d2..882bc0b 100644
--- a/systemd/mdadm-grow-continue@.service
+++ b/systemd/mdadm-grow-continue@.service

@@ -10,7 +10,7 @@ Description=Manage MD Reshape on /dev/%I
 DefaultDependencies=no
 
 [Service]
-ExecStart=BINDIR/mdadm --grow --continue /dev/%I
+ExecStart=BINDIR/mdadm --grow --continue /dev/%i
 StandardInput=null
 StandardOutput=null
 StandardError=null

-- 
2.10.2