if error -> exit 1

builds/amd64/installer/legacy/builds/amd64-installer.sh

@@ -281,7 +281,7 @@ installer_standard_gpt_install()
       DEV=$(blkid | grep ONIE-BOOT | awk '{print $1}' |  sed -e 's/[1-9][0-9]*:.*$//' | sed -e 's/\([0-9]\)\(p\)/\1/' | head -n 1)
       [ -b "$DEV" ] || {
           echo "Error: Unable to determine the block device to install NOS"
-          return 1
+          exit 1
       }
   fi