Fix division by zero bug triggered by pointers to opaque structs.
Fix division by zero bug triggered by pointers to opaque structs.


darlinghq/darling-libobjc2,ngrewe/libobjc2,ngrewe/libobjc2,davidchisnall/libobjc2,darlinghq/darling-libobjc2,davidchisnall/libobjc2,gnustep/libobjc2,gnustep/libobjc2,crystax/android-vendor-libobjc2,crystax/android-vendor-libobjc2