fix(log): remove LSP warnings from log.lua

Minor changes to log.lua to remove potential issues made apparent by the
LSP.

lua/tjdevries/log.lua

@@ -2,6 +2,7 @@
 --
 -- Inspired by rxi/log.lua
 -- Modified by tjdevries and can be found at github.com/tjdevries/vlog.nvim
+-- Further modified by sherlock5512 as part of these dotfiles
 --
 -- This library is free software; you can redistribute it and/or modify it
 -- under the terms of the MIT license. See LICENSE for details.
@@ -109,6 +110,7 @@ log.new = function(config, standalone)
         vim.cmd(string.format("echohl %s", level_config.hl))
       end
 
+---@diagnostic disable-next-line: missing-parameter -- This function can be called with only two parameters
       local split_console = vim.split(console_string, "\n")
       for _, v in ipairs(split_console) do
         vim.cmd(string.format([[echom "[%s] %s"]], config.plugin, vim.fn.escape(v, '"')))
@@ -121,7 +123,7 @@ log.new = function(config, standalone)
 
     -- Output to log file
     if config.use_file then
-      local fp = io.open(outfile, "a")
+      local fp = assert(io.open(outfile, "a"),"Could not open " .. outfile .. "!")
       local str = string.format("[%-6s%s] %s: %s\n",
       nameupper, os.date(), lineinfo, msg)
       fp:write(str)