Update build-u-boot-with-docker.yml

.github/workflows/build-u-boot-with-docker.yml

@@ -57,7 +57,6 @@ jobs:
       - name: Download changes
         uses: actions/download-artifact@v2
         with:
-          path: changes.txt
           name: changes
 
       - name: Prepare matrix
@@ -65,7 +64,7 @@ jobs:
         run: |
 
           MATRIX="cat build/config/target*.conf | grep -v \"^$\" | grep -v \"^#\" | ${{ inputs.include }} ${{ inputs.exclude }} sed 's/\s\s*/ /g' | cut -d' ' -f1,2 | sed 's/ /:/g' | sort | uniq"
-          [ ! -s changes.txt ] || unset MATRIX
+          [ -s changes.txt ] || unset MATRIX
           echo ::set-output name=matrix::$(for x in $(eval $MATRIX); do echo $x; done|jq -cnR '[inputs | select(length>0)]' | jq)
        
   U-boot: