This patch fixes a long-standing (albeit unidentified) problem in the
queueing code for the UHCI HCD.  The code propagates data toggle settings
between messages in a queue for control transfers just the same as bulk
and interrupt transfers.  That is a mistake, since control messages always
restart with data toggle 0.  With this patch, the UHCI driver now passes
test 10 (control URB queueing) in David Brownell's usbtest suite.

The patch appears to change more than it really does, because it alters
the indentation level of a large section of code.