cmd/viewcore: print correct argument when parsing fails

This can result in an out-of-bounds failure instead of a parsing error
as one expects.

Change-Id: Iad88f5688d3967bcbe92bf4c91923a3b975e9e07
Reviewed-on: https://go-review.googlesource.com/c/debug/+/699976
Reviewed-by: Michael Pratt <mpratt@google.com>
Auto-Submit: Nicolas Hillegeer <aktau@google.com>
Reviewed-by: Annie Poláková <annieplkv@gmail.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>

cmd/viewcore/main.go

diff --git a/cmd/viewcore/main.go b/cmd/viewcore/main.go
index f1106de..8386507 100644
--- a/cmd/viewcore/main.go
+++ b/cmd/viewcore/main.go
@@ -622,12 +622,12 @@
 	}
 	n, err := strconv.ParseInt(args[0], 16, 64)
 	if err != nil {
-		exitf("can't parse %q as an object address\n", args[1])
+		exitf("can't parse %q as an object address\n", args[0])
 	}
 	a := core.Address(n)
 	obj, _ := c.FindObject(a)
 	if obj == 0 {
-		exitf("can't find object at address %s\n", args[1])
+		exitf("can't find object at address %s\n", args[0])
 	}
 
 	// Breadth-first search backwards until we reach a root.
@@ -734,7 +734,7 @@
 	}
 	n, err := strconv.ParseInt(args[0], 16, 64)
 	if err != nil {
-		exitf("can't parse %q as an object address\n", args[1])
+		exitf("can't parse %q as an object address\n", args[0])
 	}
 	a := core.Address(n)
 	if len(args) < 2 {
@@ -742,7 +742,7 @@
 	} else {
 		n, err = strconv.ParseInt(args[1], 10, 64)
 		if err != nil {
-			exitf("can't parse %q as a byte count\n", args[2])
+			exitf("can't parse %q as a byte count\n", args[1])
 		}
 	}
 	if !p.ReadableN(a, n) {