Clang warnings in ecc25519

[briandw]

I'm seeing these warnings from Xcode 6.3:

/.../wolfssl/wolfcrypt/src/ecc25519.c:153:24: warning: comparison of array 'private_key->k.point' equal to a null pointer is always false [-Wtautological-pointer-compare]
if (private_key->k.point == NULL || public_key->p.point == NULL)
~~~~~~~~~~~~~~~^~~~~ ~~~~
/.../wolfssl/wolfcrypt/src/ecc25519.c:153:55: warning: comparison of array 'public_key->p.point' equal to a null pointer is always false [-Wtautological-pointer-compare]
if (private_key->k.point == NULL || public_key->p.point == NULL)
~~~~~~~~~~~~~~^~~~~ ~~~~

[JacobBarthelmeh]

Thanks for the catch.