PCI: Add check code for last image indicator not set

If the "last image" indicator was not set in the PCI data struct, print "No
more image in the PCI ROM" instead of looping back and printing "Invalid
PCI ROM header signature".
Signed-off-by: Rex Zhu <Rex.Zhu@amd.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>

drivers/pci/rom.c

@@ -108,6 +108,12 @@ size_t pci_get_rom_size(struct pci_dev *pdev, void __iomem *rom, size_t size)
 		/* Avoid iterating through memory outside the resource window */
 		if (image >= rom + size)
 			break;
+		if (!last_image) {
+			if (readw(image) != 0xAA55) {
+				pci_info(pdev, "No more image in the PCI ROM\n");
+				break;
+			}
+		}
 	} while (length && !last_image);
 
 	/* never return a size larger than the PCI resource window */