.github: fix logic in weekly workflow

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

.github/workflows/weekly.yml

@@ -14,14 +14,14 @@ jobs:
   schedule:
     runs-on: ubuntu-latest
     outputs:
-      run: ${{ steps.check.outputs.run }}
+      run: ${{ steps.schedule.outputs.run }}
     steps:
       - uses: actions/checkout@v4
       - name: Check for any commits since last week
         id: schedule
         run: |
           commits="$(git log --format=%H --since='1 week ago')"
-          if [ -n "$commits" ]; then
+          if [ -z "$commits" ]; then
               echo "run=true"  >> $GITHUB_OUTPUT
           else
               echo "run=false" >> $GITHUB_OUTPUT