Resolve address sanitizer finding when using clang compiler.
Resolve address sanitizer finding when using clang compiler.

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