xhci: dbc: Use sizeof_field() where it makes sense

Instead of doing custom calculations, use sizeof_field() macro.
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/20231201150647.1307406-9-mathias.nyman@linux.intel.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/host/xhci-dbgcap.c

@@ -374,7 +374,7 @@ static void xhci_dbc_eps_init(struct xhci_dbc *dbc)
 
 static void xhci_dbc_eps_exit(struct xhci_dbc *dbc)
 {
-	memset(dbc->eps, 0, sizeof(struct dbc_ep) * ARRAY_SIZE(dbc->eps));
+	memset(dbc->eps, 0, sizeof_field(struct xhci_dbc, eps));
 }
 
 static int dbc_erst_alloc(struct device *dev, struct xhci_ring *evt_ring,