hdd/functions.sh: skip zfs if missed

hdd/functions.sh

@@ -165,10 +165,10 @@ print_wwn()
 list_zpool_drives()
 {
     local i
-    local POOLS=$(zpool status -L -P | grep "^  pool:" | sed -e 's/^  pool://')
+    local POOLS=$(zpool status -L -P 2>/dev/null | grep "^  pool:" | sed -e 's/^  pool://')
     #echo $POOLS
     for i in $POOLS ; do
-        zpool status -L -P $i | grep /dev/ | while read drive status last; do
+        zpool status -L -P $i 2>/dev/null | grep /dev/ | while read drive status last; do
             echo "$i $drive $status"
         done
     done