(b) Appeal by permission instead of as of right. An appeal taken by permission shall not be dismissed upon the ground that the appeal would lie as of right and was not taken within the time limited for an appeal as of right, provided the motion for permission was made within the time limited for taking the appeal.
(c) Defects in form. Where a notice of appeal is premature or contains an inaccurate description of the judgment or order appealed from, the appellate court, in its discretion, when the interests of justice so demand, may treat such a notice as valid.