usb: dwc3: core: Fix unused variable warning in core driver

While fixing a merge conflict in linux-next, hw_mode variable
was left unused. Remove the unused variable in hs_phy_setup call.

Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/all/202405030439.AH8NR0Mg-lkp@intel.com/
Signed-off-by: Krishna Kurapati <quic_kriskura@quicinc.com>
Acked-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Link: https://lore.kernel.org/r/20240506074939.1833835-1-quic_kriskura@quicinc.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/dwc3/core.c

@@ -673,11 +673,8 @@ static int dwc3_ss_phy_setup(struct dwc3 *dwc, int index)
 
 static int dwc3_hs_phy_setup(struct dwc3 *dwc, int index)
 {
-	unsigned int hw_mode;
 	u32 reg;
 
-	hw_mode = DWC3_GHWPARAMS0_MODE(dwc->hwparams.hwparams0);
-
 	reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(index));
 
 	/* Select the HS PHY interface */