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<https://github.com/RTimothyEdwards/magic/pull/215|#215 Fix build with Clang 15.>
Pull request opened by <https://github.com/brad0|brad0>
Use a cast to fix the build with Clang 15.

```
DBpaint.c:1542:37: error: incompatible pointer to integer conversion passing 'DiagInfo *' (aka 'struct diag_info *') to parameter of type 'ClientData' (aka 'unsigned long') [-Wint-conversion]
                newType = DBDiagonalProc(oldType, &amp;dinfo);
                                                  ^~~~~~
```
<https://github.com/RTimothyEdwards/magic|RTimothyEdwards/magic>
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