proc: kill the extra proc_readfd_common()->dir_emit_dots()

proc_readfd_common() does dir_emit_dots() twice in a row,
we need to do this only once.
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

fs/proc/fd.c

@@ -228,8 +228,6 @@ static int proc_readfd_common(struct file *file, struct dir_context *ctx,
 	if (!p)
 		return -ENOENT;
 
-	if (!dir_emit_dots(file, ctx))
-		goto out;
 	if (!dir_emit_dots(file, ctx))
 		goto out;
 	files = get_files_struct(p);