Fix errors of the RevGNN example

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[codecov]

Codecov Report

Merging #4715 (3e751c3) into master (f482cb7) will decrease coverage by 1.92%.
The diff coverage is n/a.

❗ Current head 3e751c3 differs from pull request most recent head f5526cd. Consider uploading reports for the commit f5526cd to get more accurate results

@@            Coverage Diff             @@
##           master    #4715      +/-   ##
==========================================
- Coverage   84.25%   82.32%   -1.93%     
==========================================
  Files         318      318              
  Lines       17126    17123       -3     
==========================================
- Hits        14429    14097     -332     
- Misses       2697     3026     +329     

Impacted Files	Coverage Δ
torch_geometric/nn/models/dimenet_utils.py	0.00% <0.00%> (-75.52%)	⬇️
torch_geometric/nn/models/dimenet.py	14.51% <0.00%> (-53.00%)	⬇️
torch_geometric/nn/conv/utils/typing.py	81.25% <0.00%> (-17.50%)	⬇️
torch_geometric/nn/resolver.py	86.36% <0.00%> (-9.10%)	⬇️
torch_geometric/nn/inits.py	67.85% <0.00%> (-7.15%)	⬇️
torch_geometric/io/tu.py	93.90% <0.00%> (-2.44%)	⬇️
torch_geometric/nn/models/mlp.py	98.52% <0.00%> (-1.48%)	⬇️
torch_geometric/transforms/gdc.py	78.17% <0.00%> (-1.02%)	⬇️
torch_geometric/data/dataset.py	96.80% <0.00%> (-0.80%)	⬇️
torch_geometric/nn/conv/rgat_conv.py	83.76% <0.00%> (-0.53%)	⬇️
... and 2 more

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[rusty1s]

Ups :)