fixed wrong va_list intitialization

29 jobs for feature_Cpp11BuildAndTest in 17 minutes and 25 seconds (queued for 5 seconds)
Name Stage Failure
failed
compile failure test Build
    1 | void failfunc() { IwillFailToCompile }
| ^~~~~~~~~~~~~~~~~~
scons: *** [build_32/testfw/dummytest/.build/Linux_glibc_2.9-x86_64-32_optimized_trace/ForcedCompileFailureTest.o] Error 1
scons: building terminated because of errors.
2020-11-14 00:12:23,486 [WARNING ] [SConsider.Main ]: scons: printing failed nodes
build_32/testfw/dummytest/.build/Linux_glibc_2.9-x86_64-32_optimized_trace/ForcedCompileFailureTest.o
scons: done printing failed nodes (Main.py:305)
Cleaning up file based variables
ERROR: Job failed: exit code 1