staging: dwc2: fix screwup in checking return value

Fix screwup in checking return value from dwc2_is_controller_alive()
Signed-off-by: Paul Zimmerman <paulz@synopsys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/dwc2/hcd_intr.c

@@ -2059,7 +2059,7 @@ irqreturn_t dwc2_handle_hcd_intr(struct dwc2_hsotg *hsotg)
 	u32 gintsts, dbg_gintsts;
 	irqreturn_t retval = IRQ_NONE;
 
-	if (!dwc2_is_controller_alive(hsotg) < 0) {
+	if (!dwc2_is_controller_alive(hsotg)) {
 		dev_warn(hsotg->dev, "Controller is dead\n");
 		return retval;
 	}