Addressed issues from code review.  Added dlna_src_head_response_free() to free memory which was allocated associated with HEAD response.  Changed string initialization to { 0 } instead of memset().  Switch from strcat() to strncat() for calls which take strings (left string literals using strcat()).  Switch calls to strtok() to g_strsplit().  Got rid of unused time_seek_hdr in head_response.