path: present the correct error message in TestMatch

The message was hardcoded to indicate that the test wanted a nil error, even
though in some cases a specific error was wanted. This patch fixes the
message to print the wanted error.

Change-Id: Id86ea89d6f41f25bfa164acc50142ae8ff0ec410
GitHub-Last-Rev: c220374845667942c608c02afadff95443e2ec20
GitHub-Pull-Request: golang/go#26674
Reviewed-on: https://go-review.googlesource.com/126619Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

src/path/match_test.go

@@ -73,7 +73,7 @@ func TestMatch(t *testing.T) {
 	for _, tt := range matchTests {
 		ok, err := Match(tt.pattern, tt.s)
 		if ok != tt.match || err != tt.err {
-			t.Errorf("Match(%#q, %#q) = %v, %v want %v, nil", tt.pattern, tt.s, ok, err, tt.match)
+			t.Errorf("Match(%#q, %#q) = %v, %v want %v, %v", tt.pattern, tt.s, ok, err, tt.match, tt.err)
 		}
 	}
 }