PCI: fu740: Remove unused assignments

fu740_pcie_host_init() assigned "ret", but never used the value.  Drop it.

Found by Krzysztof using cppcheck:

  $ cppcheck --enable=all --force
  unreadVariable drivers/pci/controller/dwc/pcie-fu740.c:227 Variable 'ret' is assigned a value that is never used.
Reported-by: NKrzysztof Wilczyński <kw@linux.com>
Link: https://lore.kernel.org/r/20220313192933.434746-4-helgaas@kernel.orgSigned-off-by: NBjorn Helgaas <bhelgaas@google.com>

drivers/pci/controller/dwc/pcie-fu740.c

@@ -224,7 +224,7 @@ static int fu740_pcie_host_init(struct pcie_port *pp)
 	/* Clear hold_phy_rst */
 	writel_relaxed(0x0, afp->mgmt_base + PCIEX8MGMT_APP_HOLD_PHY_RST);
 	/* Enable pcieauxclk */
-	ret = clk_prepare_enable(afp->pcie_aux);
+	clk_prepare_enable(afp->pcie_aux);
 	/* Set RC mode */
 	writel_relaxed(0x4, afp->mgmt_base + PCIEX8MGMT_DEVICE_TYPE);