registry/auth/token: fix the surrounding loop is unconditionally terminate

registry/auth/token/types_test.go:83:3: SA4004: the surrounding loop is unconditionally terminated (staticcheck)
                   return
                   ^

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

registry/auth/token/types_test.go

@@ -81,7 +81,5 @@ func assertStringListEqual(t *testing.T, expected []string, actual []string) {
 		if v != actual[i] {
 			t.Errorf("expected %d. item to be %q, got %q", i, v, actual[i])
 		}
-
-		return
 	}
 }