fs: f2fs: Remove unnecessary checks of SM_I(sbi) in update_general_status()

In fill_super() and put_super(), f2fs_destroy_stats() is called
in prior to f2fs_destroy_segment_manager(), so if current
sbi can still be visited in global stat list, SM_I(sbi) should be
released yet.
For this reason, SM_I(sbi) does not need to be checked in
update_general_status().
Thank Chao Yu for advice.
Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/debug.c

@@ -67,7 +67,7 @@ static void update_general_status(struct f2fs_sb_info *sbi)
 	si->nr_rd_data = get_pages(sbi, F2FS_RD_DATA);
 	si->nr_rd_node = get_pages(sbi, F2FS_RD_NODE);
 	si->nr_rd_meta = get_pages(sbi, F2FS_RD_META);
-	if (SM_I(sbi) && SM_I(sbi)->fcc_info) {
+	if (SM_I(sbi)->fcc_info) {
 		si->nr_flushed =
 			atomic_read(&SM_I(sbi)->fcc_info->issued_flush);
 		si->nr_flushing =
@@ -75,7 +75,7 @@ static void update_general_status(struct f2fs_sb_info *sbi)
 		si->flush_list_empty =
 			llist_empty(&SM_I(sbi)->fcc_info->issue_list);
 	}
-	if (SM_I(sbi) && SM_I(sbi)->dcc_info) {
+	if (SM_I(sbi)->dcc_info) {
 		si->nr_discarded =
 			atomic_read(&SM_I(sbi)->dcc_info->issued_discard);
 		si->nr_discarding =