linux-generic: helper api: fix type casting for C++ include
linux-generic: helper api: fix type casting for C++ include

Helper's chksum.h API had a void* to uint16_t* casting, which is not
legal in C++ (Clang and GCC).

Signed-off-by: Oriol Arcas <a98c9d4e37de3d71db2e1a293b51c579a914c4ae@starflownetworks.com>
Reviewed-by: Bill Fischofer <52f3c909d51cc5d355a68a403df6906b3c1a8f83@linaro.org>

erachmi/odp,erachmi/odp,erachmi/odp,erachmi/odp