xhci: dbc: Check for errors first in xhci_dbc_stop()

The usual pattern is to check for errors and then continue if none.
Apply that pattern to xhci_dbc_stop() code.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Link: https://lore.kernel.org/r/20231201150647.1307406-6-mathias.nyman@linux.intel.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>