correct offsets — off by 4 error

Reference: /n/atom/patch/applied/pcimsixcapfix
Date: Thu Jan  2 03:56:53 CET 2014
Signed-off-by: quanstro@quanstro.net

--- /sys/src/cmd/pci/pci.c	Thu Jan  2 03:56:34 2014
+++ /sys/src/cmd/pci/pci.c	Thu Jan  2 03:56:35 2014
@@ -107,9 +107,16 @@
 	u32int u;
 
 	Bprint(&o, "\t" "msi-x\n");
-	u = pcicfgr32(p, off + 0);
-	Bprint(&o, "\t\t" "table: offset %.8ux; bar %d\n", u&~7, u&7);
+	u = pcicfgr16(p, off + 2);
+	Bprint(&o, "\t\t" "ctl: %.4ux; size %d ", u, (u&0x7ff)+1);
+	if(u & 1<<15)
+		Bprint(&o, "en ");
+	if(u & 1<<15)
+		Bprint(&o, "msk ");
+	Bprint(&o, "\n");
 	u = pcicfgr32(p, off + 4);
+	Bprint(&o, "\t\t" "table: offset %.8ux; bar %d\n", u&~7, u&7);
+	u = pcicfgr32(p, off + 8);
 	Bprint(&o, "\t\t" "pba: offset %.8ux; bar %d\n", u&~7, u&7);
 }