net: sockets: prevent null pointer dereference

According to the POSIX specification, null pointer
is a valid value for the `address` argument
of the `accept` function.
This commit adds a check to prevent a null pointer
dereference inside `z_impl_zsock_accept`.

Signed-off-by: Mirko Covizzi <mirko.covizzi@nordicsemi.no>
1 file changed