change %u in syscommon
Merge branch 'master' of https://github.com/popacai/TQOS
add check for buffer less than 0
Merge branch 'master' of https://github.com/popacai/TQOS

Conflicts:
	code/test/test_invalidexec.c
Merge branch 'master' of https://github.com/popacai/TQOS