stdlib: Fix checkpoint setting through set_workload func

Due to a typo ('checkpoint_dir' instead of 'checkpoint'), setting
checkpoints via the set_workload functions was not working. This patch
fixes this error.

Change-Id: I5720406f2a01f166666e80079c1f84651f750fe2
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/68277
Maintainer: Bobby Bruce <bbruce@ucdavis.edu>
Reviewed-by: Bobby Bruce <bbruce@ucdavis.edu>
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>
1 file changed