Fix coverity report

One false positive: Coverity-Id: 1023902. default constructor would have taken care of it.
One real one: Coverity-Id: 1023901; in operator= ; we weren't copying the AES IV from the copied HLSStream

mythtv/libs/libmythtv/HLS/httplivestreambuffer.cpp

@@ -394,6 +394,7 @@ class HLSStream
         m_url           = uri;
 #ifdef USING_LIBCRYPTO
         m_ivloaded      = false;
+        memset(m_AESIV, 0, sizeof(m_AESIV));
 #endif
     }
 
@@ -439,6 +440,7 @@ class HLSStream
 #ifdef USING_LIBCRYPTO
         m_keypath       = rhs.m_keypath;
         m_ivloaded      = rhs.m_ivloaded;
+        memcpy(m_AESIV, rhs.m_AESIV, sizeof(m_AESIV));
 #endif
         return *this;
     }