Force check the filesystem before resizing

The message buffer of the kernel lists
> Please run 'e2fsck -f /dev/disk/by-label/nixos' first.
as the output of the command `resize2fs "$device"`.
This fixes NixOS/nixpkgs#26910.

nixos/modules/system/boot/stage-1-init.sh

@@ -301,6 +301,7 @@ mountFS() {
         *x-nixos.autoresize*)
             if [ "$fsType" = ext2 -o "$fsType" = ext3 -o "$fsType" = ext4 ]; then
                 echo "resizing $device..."
+                e2fsck -fp "$device"
                 resize2fs "$device"
             fi
             ;;