[PATCH] Avoid /proc/{ioports,iomem} truncation

[PATCH] Avoid /proc/{ioports,iomem} truncation

The current seq_file code for resource handling will truncate the output
if it overflows the seq_file buffer (one page).  That's because it tries
to traverse the resource tree in one big blob.

So change that to instead traverse the resource tree one entry at a time
and have a real iterator, and clean it up a bit.