usb-ohci: Fix logical condition in start_ohci function

Correct the logical condition in the start_ohci function to ensure
proper evaluation of the status variable.

Fix warning:

./src/hw/usb-ohci.c:192:13: warning: logical not is only applied to the left hand side of this bitwise operator [-Wlogical-not-parentheses]
  192 |         if (! status & OHCI_HCR)

Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Reviewed-by: Gerd Hoffmann <kraxel@redhat.com>