Cast pointers to void pointer before printing with %p

[nirmal-mina]

Summary

Fixes portability issues around %p formatting.

%p expects a void *. Passing other pointer types directly can trigger compiler warnings and is technically not portable.

Changes

• 01/mem.c: cast pointer argument to (void *).
• 06/va.c: cast object pointer argument to (void *).

Note

Function pointers are not strictly portable to print with %p; this PR keeps the example simple while reducing avoidable warnings where possible.

Testing

• Compiled affected examples with warnings enabled.