f2fs: give a warning only for readonly partition

Let's allow mounting readonly partition. We're able to recovery later once we
have it as read-write back.
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/super.c

@@ -3933,12 +3933,10 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
 		 * previous checkpoint was not done by clean system shutdown.
 		 */
 		if (f2fs_hw_is_readonly(sbi)) {
-			if (!is_set_ckpt_flags(sbi, CP_UMOUNT_FLAG)) {
-				err = -EROFS;
+			if (!is_set_ckpt_flags(sbi, CP_UMOUNT_FLAG))
 				f2fs_err(sbi, "Need to recover fsync data, but write access unavailable");
-				goto free_meta;
-			}
-			f2fs_info(sbi, "write access unavailable, skipping recovery");
+			else
+				f2fs_info(sbi, "write access unavailable, skipping recovery");
 			goto reset_checkpoint;
 		}