debug: suppress cppcheck warning

debug: suppress cppcheck warning

src/util-debug.c:1562:5: warning: Either the condition 'sc_lid!=NULL' is redundant or there is possible null pointer dereference: sc_lid. [nullPointerRedundantCheck]
    sc_lid->global_log_level = MAX(sc_lid->global_log_level, max_level);
    ^
src/util-debug.c:1569:16: note: Assuming that condition 'sc_lid!=NULL' is not redundant
    if (sc_lid != NULL)
               ^
src/util-debug.c:1562:5: note: Null pointer dereference
    sc_lid->global_log_level = MAX(sc_lid->global_log_level, max_level);
    ^