test_hybrid.cpp: Fix crashing test due to NULL timeval (see below).
test_hybrid.cpp: Fix crashing test due to NULL timeval (see below).

The crash is obscure and only appears in certain combinations of compiler and platform.

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