Moved packet length sanity check until after we've derived the expected tag length based on the session context.  This resolves the compiler warning due to tag_len being used uninitialized.
Moved packet length sanity check until after we've derived the expected tag length based on the session context.  This resolves the compiler warning due to tag_len being used uninitialized.

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