HTTPLIVE: do not store hash of malformed M3U8 file

From code analysis, we should make sure that M3UParser::initCheck
returns OK then perform hash memcpy. This would prevent NuPlayer from
overlooking a malformed M3U8 and crashing later on a NULL derefernce.

Test: 1 Play http://117.34.15.47/7d.v.iask.com/player/ovs1_idx_chid_1054589_br_400_fn_4_pn_weitv_sig_md5.m3u8
      2 mediaserver does not crash

Bug: 33763371
Change-Id: I3d8f5450cdf45288110121973c679c8d58210d5c