Adjust a help text for external PCI programmers to the new parameter scheme

Pointed out by Maciej Pijanka.

Corresponding to flashrom svn r754.
Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Acked-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>

pcidev.c

@@ -100,7 +100,7 @@ uint32_t pcidev_init(uint16_t vendor_id, uint32_t bar,
 		exit(1);
 	} else if (found > 1) {
 		fprintf(stderr, "Error: Multiple supported PCI devices found. "
-			"Use 'flashrom -p xxxx=bb:dd.f' \n"
+			"Use 'flashrom -p xxxx:bb:dd.f' \n"
 			"to explicitly select the card with the given BDF "
 			"(PCI bus, device, function).\n");
 		exit(1);