f2fs: avoid stale fi->gdirty_list pointer

When doing fault injection test, f2fs_evict_inode() didn't remove gdirty_list
which incurs a kernel panic due to wrong pointer access.

Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/inode.c

@@ -520,8 +520,10 @@ no_delete:
 	stat_dec_inline_dir(inode);
 	stat_dec_inline_inode(inode);
 
-	if (!is_set_ckpt_flags(sbi, CP_ERROR_FLAG))
+	if (likely(!is_set_ckpt_flags(sbi, CP_ERROR_FLAG)))
 		f2fs_bug_on(sbi, is_inode_flag_set(inode, FI_DIRTY_INODE));
+	else
+		f2fs_inode_synced(inode);
 
 	/* ino == 0, if f2fs_new_inode() was failed t*/
 	if (inode->i_ino)