Add a missing `void *`-to-`char *` cast
Add a missing `void *`-to-`char *` cast

`NSData-bytes` returns a `const void *`. Cast it to a `const char *`
before trying to use with a `%s` format specifier.

thomasvl/google-toolbox-for-mac,google/google-toolbox-for-mac,google/google-toolbox-for-mac,thomasvl/google-toolbox-for-mac