`NULL` as defined by the standard is not guaranteed to be of a pointer
type. In order to make sure that in vararg API's a pointer type is used,
define our own version and use that one internally.
Signed-off-by: Steffen Jaeckel <s@jaeckel.eu>
Previously it was not detected if `inlen` itself was too big and would
overflow the multiplication by 8.
Related to #592
Signed-off-by: Steffen Jaeckel <s@jaeckel.eu>
Uninitialized key caused the following error:
Conditional jump or move depends on uninitialised value(s)
at ...: __memcmp_sse4_1 (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
...
