Fixed a bunch of typos and issues in syscontrol uevent update

libs/syscontrol.lua

@@ -90,19 +90,19 @@ syscontrol.power_supply.read_attribs = function(dev_name)
         end
         local uevent_data = {}
         local device = {
-            type = fhandler:read("*a"),
+            type = fhandler:read("*a"):match("%S*"),
             full_path = "/sys/class/power_supply/"..dev_name,
             name = dev_name
         }
         fhandler:close()
-        uevent:read("*a"):gsub("[^\n]+",function(line)
+        uevent_f:read("*a"):gsub("[^\n]+",function(line)
             local key,value = line:match("^([^=]+)=([^=]*)")
             if value:match("^%d+$") then
                 value = tonumber(value)
             end
             uevent_data[key] = value
         end)
-        uevent:close()
+        uevent_f:close()
         if device.type == "Battery" then
             device.model = uevent_data.POWER_SUPPLY_MODEL_NAME or "N/A"
             device.energy_full_design = uevent_data.POWER_SUPPLY_ENERGY_FULL_DESIGN
@@ -117,6 +117,7 @@ syscontrol.power_supply.read_attribs = function(dev_name)
         elseif device.type == "Mains" then
             device.online = (uevent_data.POWER_SUPPLY_ONLINE == 1)
         end
+        return device
     else
         return nil, err
     end