Revert "Use :argdo instead of :bufdo in s:startup"

This reverts commit bcada53.

This fix bogado#56

plugin/file_line.vim

@@ -48,33 +48,20 @@ function! s:gotoline()
 			let line_num  = l:names[2] == ''? '0' : l:names[2]
 			let  col_num  = l:names[3] == ''? '0' : l:names[3]
 			call s:reopenAndGotoLine(file_name, line_num, col_num)
-			return file_name
+			break
 		endif
 	endfor
 endfunction
 
-" Handle entry in the argument list.
-" This is called via `:argdo` when entering Vim.
-function! s:handle_arg()
-	let argname = expand('%')
-	let fname = s:gotoline()
-	if fname != argname
-		let argidx = argidx()
-		exec (argidx+1).'argdelete'
-		exec (argidx)'argadd' fname
-	endif
-endfunction
-
-function! s:startup()
+function s:startup()
 	autocmd! BufNewFile * nested call s:gotoline()
 	autocmd! BufRead * nested call s:gotoline()
-
-	if argc() > 0
-		let argidx=argidx()
-		argdo call s:handle_arg()
-		exec (argidx+1).'argument'
-		" Manually call Syntax autocommands, ignored by `:argdo`.
-		doautocmd Syntax
+	silent! bufdo call s:gotoline()
+	silent! bfirst
+	doautocmd FileType
+	doautocmd BufEnter
+	if &diff
+		diffthis
 	endif
 endfunction