Another PNG bug with 5.4+

[Traktormaster]

I have a PNG image file that I wanted to open. It's fine with Pillow 5.3 but not with 5.4 or 5.4.1.
I thought #3535 was going to fix this as well but it did not. Here's the exception:

Traceback (most recent call last):
  File "<input>", line 1, in <module>
  File "/home/user/.local/share/virtualenvs/proj/lib/python3.7/site-packages/PIL/ImageFile.py", line 252, in load
    self.load_end()
  File "/home/user/.local/share/virtualenvs/proj/lib/python3.7/site-packages/PIL/PngImagePlugin.py", line 680, in load_end
    self.png.call(cid, pos, length)
  File "/home/user/.local/share/virtualenvs/proj/lib/python3.7/site-packages/PIL/PngImagePlugin.py", line 140, in call
    return getattr(self, "chunk_" + cid.decode('ascii'))(pos, length)
AttributeError: 'PngStream' object has no attribute 'chunk_exIf'

• OS: Arch Linux
• Python: 3.7.2
• Pillow: 5.4.1

from PIL import Image
im = Image.open('breaking_pillow_png_exif.png')
im.load()  # raises AttributeError with 5.4+

[radarhere]

Hi. This is actually a duplicate of #3557, and so it can also be resolved by #3558

[radarhere]

#3558 has now been merged, so this should be fixed in master.