sim-se: fix a few bugs/warns from GCC 6

Change-Id: Ib2ad860324fd234b23262d141be3e82628ff61f0
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/12126
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Brandon Potter <Brandon.Potter@amd.com>
Maintainer: Brandon Potter <Brandon.Potter@amd.com>
1 file changed