opendingux: Use LZO for swap, not LZ4HC

LZ4HC is much slower to compress than LZO, which makes it unpractical
for zram swap. LZ4 is a bit faster for both compression and decompression,
but uses a lot of RAM (~10 MiB) to do so.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>

board/opendingux/target_skeleton/etc/init.d/S09swap.sh

@@ -8,8 +8,10 @@ SWAPPINESS=20
 # User overrides.
 [ -r /usr/local/etc/swap.conf ] && . /usr/local/etc/swap.conf
 
+[ $SWAP_PERCENT_MEM -gt 0 ] || exit 0
+
 SWAP_FILE_MB=$(expr $(sed -n 's/MemTotal: \+\([[:digit:]]\+\).*/\1/p' /proc/meminfo) \* ${SWAP_PERCENT_MEM} / 102400)
-SWAP_FILE=$(zramctl -a lz4hc -s ${SWAP_FILE_MB}M -f)
+SWAP_FILE=$(zramctl -a lzo -s ${SWAP_FILE_MB}M -f)
 
 echo $SWAPPINESS > /proc/sys/vm/swappiness