Fix #122770: Crash with "High Quality Normals" and loose edges/verts

Caused by a simple mistake in 84c4ddbbb9.

source/blender/draw/intern/mesh_extractors/extract_mesh_vbo_lnor.cc

@@ -209,7 +209,7 @@ void extract_normals(const MeshRenderData &mr, const bool use_hq, gpu::VertBuf &
       GPU_vertformat_alias_add(&format, "lnor");
     }
     GPU_vertbuf_init_with_format(vbo, format);
-    GPU_vertbuf_data_alloc(vbo, mr.corners_num);
+    GPU_vertbuf_data_alloc(vbo, size);
     MutableSpan vbo_data(static_cast<short4 *>(GPU_vertbuf_get_data(vbo)), size);
     MutableSpan corners_data = vbo_data.take_front(mr.corners_num);
     MutableSpan loose_data = vbo_data.take_back(mr.loose_indices_num);