gfs2: Initialize gl_no_formal_ino earlier

[ Upstream commit 1072b3aa ]

Set gl_no_formal_ino of the iopen glock to the generation of the
associated inode (ip->i_no_formal_ino) as soon as that value is known.
This saves us from setting it later, possibly repeatedly, when queuing
GLF_VERIFY_DELETE work.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Stable-dep-of: 2c63986d ("gfs2: deallocate inodes in gfs2_create_inode")
Signed-off-by: Sasha Levin <sashal@kernel.org>