fix gcc warning: pointer should be cast to unsigned long
fix gcc warning: pointer should be cast to unsigned long

tests/regression/01-cpa/29-fun_struct_array.c:15:24: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
   15 |   struct a A[1] = {50, (unsigned int)&QQ};
      |                        ^
In file included from tests/regression/01-cpa/29-fun_struct_array.c:2:
tests/regression/01-cpa/29-fun_struct_array.c:18:18: warning: comparison between pointer and integer
   18 |   assert(A[0].qq == &QQ); // UNKNOWN
      |                  ^~

goblint/analyzer,goblint/analyzer,goblint/analyzer,goblint/analyzer,goblint/analyzer