PCI: dwc: Clean up computing of msix_tbl

Commit 6f5e193b ("PCI: dwc: Fix dw_pcie_ep_raise_msix_irq() to get
correct MSI-X table address") overcomplicated the computation of the
msix_tbl address. Simplify it as it's simply the addr + offset. Provided
addr is (void *) already.

objdump -d shows no difference after this patch.

Link: https://lore.kernel.org/r/20200420065227.4920-1-jslaby@suse.czSigned-off-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Kishon Vijay Abraham I <kishon@ti.com>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>

drivers/pci/controller/dwc/pcie-designware-ep.c

@@ -433,7 +433,6 @@ int dw_pcie_ep_raise_msix_irq(struct dw_pcie_ep *ep, u8 func_no,
 	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
 	struct pci_epf_msix_tbl *msix_tbl;
 	struct pci_epc *epc = ep->epc;
-	struct pci_epf_bar *epf_bar;
 	u32 reg, msg_data, vec_ctrl;
 	unsigned int aligned_offset;
 	u32 tbl_offset;
@@ -446,10 +445,7 @@ int dw_pcie_ep_raise_msix_irq(struct dw_pcie_ep *ep, u8 func_no,
 	bir = (tbl_offset & PCI_MSIX_TABLE_BIR);
 	tbl_offset &= PCI_MSIX_TABLE_OFFSET;
 
-	epf_bar = ep->epf_bar[bir];
-	msix_tbl = epf_bar->addr;
-	msix_tbl = (struct pci_epf_msix_tbl *)((char *)msix_tbl + tbl_offset);
-
+	msix_tbl = ep->epf_bar[bir]->addr + tbl_offset;
 	msg_addr = msix_tbl[(interrupt_num - 1)].msg_addr;
 	msg_data = msix_tbl[(interrupt_num - 1)].msg_data;
 	vec_ctrl = msix_tbl[(interrupt_num - 1)].vector_ctrl;