fixing srtcp_protect() direction check
fixing srtcp_protect() direction check

Distrotech/libsrtp,yarrcc/libsrtp-ios,persmule/libsrtp,yarrcc/libsrtp-ios,yarrcc/libsrtp-ios,cuijinquan/libsrtp,ksophocleous/libsrtp,ksophocleous/libsrtp,persmule/libsrtp,Distrotech/libsrtp,persmule/libsrtp,cuijinquan/libsrtp,cuijinquan/libsrtp