Fix uninitialized htp_tx_t::is_last value in htp_decompressors.c
Fix uninitialized htp_tx_t::is_last value in htp_decompressors.c

glongo/libhtp,glongo/libhtp,glongo/libhtp,OISF/libhtp,wxsBSD/libhtp,glongo/libhtp,glongo/libhtp,OISF/libhtp,OISF/libhtp,wxsBSD/libhtp,wxsBSD/libhtp,wxsBSD/libhtp,glongo/libhtp,OISF/libhtp,wxsBSD/libhtp,OISF/libhtp,glongo/libhtp,wxsBSD/libhtp,OISF/libhtp,OISF/libhtp,wxsBSD/libhtp