Call parent verify method

[radarhere]

Pillow/src/PIL/PngImagePlugin.py

Lines 858 to 860 in 2ebb3e9

	if self._exclusive_fp:
	self.fp.close()
	self.fp = None

is a copy of

Pillow/src/PIL/ImageFile.py

Lines 265 to 272 in 2ebb3e9

	def verify(self) -> None:
	"""Check file integrity"""
	# raise exception if something's wrong. must be called
	# directly after open, and closes file when finished.
	if self._exclusive_fp:
	self.fp.close()
	self.fp = None

so let's just call super().verify()