mem_malloc type triviality checks (4/8)

```
git grep -l mem_malloc | xargs perl -i -lpe 's{\((\w+) \*\)mem_malloc\((\S+) \* sizeof\(\1\)\)}{mem_rmalloc<$1 *>($2)}'
```

editor/rad_init.cpp

@@ -125,7 +125,7 @@ void InitRadiosityRun() {
 void SetupFormFactors() {
   ASSERT(rad_NumElements > 0);
 
-  rad_FormFactors = (float *)mem_malloc(rad_NumElements * sizeof(float));
+  rad_FormFactors = mem_rmalloc<float>(rad_NumElements);
   ASSERT(rad_FormFactors != NULL);
 }