fix SAT warning on Linux (unknown if this breaks SAS disks)

fix template .to_i error from trying to convert an array into an integer

This is the SAT error:

/dev/sdc [megaraid_disk_14] [SAT]: Device open changed type from 'megaraid' to 'sat'
Smartctl open device: /dev/sdc [megaraid_disk_14] [SAT] failed: SATA device detected,
MegaRAID SAT layer is reportedly buggy, use '-d sat+megaraid,N' to try anyhow

templates/smartd.conf

@@ -18,7 +18,7 @@ megaraid_drives = megaraid_drives.nil? ? [] : megaraid_drives.split(/,/)
 if megaraid_device and megaraid_device != '' and
      megaraid_adapters and megaraid_adapters.to_i > 0 -%>
 <% megaraid_drives.each do |drive| -%>
-<%= megaraid_device %> -d megaraid,<%= megaraid_drives.to_i -%>
+<%= megaraid_device %> -d sat+megaraid,<%= drive.to_i %>
 <% if @device_opts.has_key?('megaraid') -%>
  <%= @device_opts['megaraid'] -%>
 <% end #newline here, please %>