overflow: don't complain about checks after use, inside a macro

overflow: don't complain about checks after use, inside a macro

The check overflow complains if we check that an index is outside of the
range that we need after we have already used it.  But there are macros
which check that an index is within the right range every time.  So they
cause a lot of false positives.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>