improve: removed the superfluous header type check

The ngx.var API only returns a Lua string in case of success or `nil` if failure. So check whether the header is a Lua table is superfluous.

Author: tokers

lib/resty/upload.lua

@@ -5,7 +5,6 @@
 local req_socket = ngx.req.socket
 local match = string.match
 local setmetatable = setmetatable
-local type = type
 local ngx_var = ngx.var
 -- local print = print
 
@@ -33,10 +32,6 @@ local function get_boundary()
  return nil
  end
 
- if type(header) == "table" then
- header = header[1]
- end
-
  local m = match(header, ";%s*boundary=\"([^\"]+)\"")
  if m then
  return m