f2fs: fix the wrong f2fs_bug_on condition in f2fs_do_replace_block

This f2fs_bug_on was introduced by commit 2c19050 ("f2fs: check
segment type in __f2fs_replace_block") when there were only 6 curseg types.
After commit d0b9e42 ("f2fs: introduce inmem curseg") was introduced,
the condition should be changed to checking curseg->seg_type.

Fixes: d0b9e42 ("f2fs: introduce inmem curseg")
Signed-off-by: LongPing Wei <weilongping@oppo.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

Author: weilongping

fs/f2fs/segment.c

@@ -3978,8 +3978,8 @@ void f2fs_do_replace_block(struct f2fs_sb_info *sbi, struct f2fs_summary *sum,
 		}
 	}
 
-	f2fs_bug_on(sbi, !IS_DATASEG(type));
 	curseg = CURSEG_I(sbi, type);
+	f2fs_bug_on(sbi, !IS_DATASEG(curseg->seg_type));
 
 	mutex_lock(&curseg->curseg_mutex);
 	down_write(&sit_i->sentry_lock);