[PATCH] ehci, qtd submit and completions

[PATCH] ehci, qtd submit and completions

 > ... usb-storage gets unhappy when
 > it decides (why?  and unsuccessfully) to reset high speed
 > devices.  ...

I don't know if that problem is resolved, but this patch
makes the question moot by handling an earlier error correctly.

The patch updates an incorrect test, so a short read will now
be treated as one.  Please merge.

This lets storage behave again.  As in, "mkfs -c" then copy
about 8 GB around, then 'dbench'.