f2fs: fix to account missing .skipped_gc_rwsem

f2fs: fix to account missing .skipped_gc_rwsem

BugLink: https://bugs.launchpad.net/bugs/1947781
[ Upstream commit ad126ebddecbf696e0cf214ff56c7b170fa9f0f7 ]

There is a missing place we forgot to account .skipped_gc_rwsem, fix it.

Fixes: 6f8d4455060d ("f2fs: avoid fi->i_gc_rwsem[WRITE] lock in f2fs_gc")
Signed-off-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Kelsey Skunberg <kelsey.skunberg@canonical.com>