Tests: Fix unused value warning

Change-Id: Iee5274235f034bc3bbb2688f6cfaa6a4a2430530
Reviewed-by: Lukas Holecek <hluk@email.cz>
Reviewed-by: hjk <hjk121@nokiamail.com>

tests/valgrind/memcheck/testapps/leak2/main.cpp

@@ -36,7 +36,7 @@ int main()
     lower = strdup("asdf");
 
     while (*lower)
-        *(lower++);
+        lower++;
 
     return 0;
 }