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Fix possible invalid pointer in MMG3D_movbdyregpt_iso after the reallocation of the xpoint array by the MMG3D_movbdyregpt_geom function.
If all tetra (resp. points) are deleted, the last deletion (iel == mesh->ne) leads to mesh->ne = -1 (resp. mesh->np = -1) and to a memory error if we don't add a security guard. See for example the `mmg3d_hybrid-nsd1` continuous integration test with PATTERN and SCOTCH options setted to off.
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This PR Fixes:
MMG3D_movbdyregpt_isoafter the reallocation of thexpointarray by theMMG3D_movbdyregpt_geomfunction (seels-CenIn-DisOut-8ParMmg continuous test for example);keep_only1subdomainfunction, seemmg3d_hybrid-nsd1continuous integration test case)It reports this last fix inside the
MMG[2D|S]_del[Pt|Elt]functions.