usb: xhci: address off-by-one in xhci_num_trbs_free()

Reduce the number of do-while loops by 1. The number of loops should be
number of segment + 1, the +1 is in case deq and enq are on the same
segment. But due to the use of a do-while loop, the expression is
evaluated after executing the loop, thus the loop is executed 1 extra
time.

Changing the do-while loop expression from "<=" to "<", reduces the loop
amount by 1. The expression "<=" would also work if it was a while loop
instead of a do-while loop.

Signed-off-by: Niklas Neronin <niklas.neronin@linux.intel.com>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Link: https://lore.kernel.org/r/20240429140245.3955523-6-mathias.nyman@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>