[petsc-dev] DMCreateMatrix_Shell

[Stefano Zampini]

I don’t understand the need of these checks (tacky and incomplete…, as per the comment) 

https://bitbucket.org/petsc/petsc/src/75aeaa18afd73be7f3020f94b788241b9e0ba3d7/src/dm/impls/shell/dmshell.c#lines-197 <https://bitbucket.org/petsc/petsc/src/75aeaa18afd73be7f3020f94b788241b9e0ba3d7/src/dm/impls/shell/dmshell.c#lines-197>

Why are these checks needed? I’m inclined to remove these lines, but I would like some comments before doing it.
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