xhci: dbc: Convert to use sysfs_streq()

It's standard approach to parse values from user space by using
sysfs_streq(). Make driver use it.
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/20231201150647.1307406-3-mathias.nyman@linux.intel.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/host/xhci-dbgcap.c

@@ -957,9 +957,9 @@ static ssize_t dbc_store(struct device *dev,
 	xhci = hcd_to_xhci(dev_get_drvdata(dev));
 	dbc = xhci->dbc;
 
-	if (!strncmp(buf, "enable", 6))
+	if (sysfs_streq(buf, "enable"))
 		xhci_dbc_start(dbc);
-	else if (!strncmp(buf, "disable", 7))
+	else if (sysfs_streq(buf, "disable"))
 		xhci_dbc_stop(dbc);
 	else
 		return -EINVAL;