Clean up tests a bit more

net/uring/.gitignore

@@ -1,3 +1,2 @@
 liburing/
 *.so
-uring-test*

net/uring/io_uring_test.go

@@ -4,6 +4,7 @@
 
 import (
 	"io/ioutil"
+	"os"
 	"testing"
 )
 
@@ -12,6 +13,7 @@ func TestFile(t *testing.T) {
 	if err != nil {
 		t.Fatalf("failed to create temp file: %v", err)
 	}
+	defer os.Remove(tmpFile.Name())
 	f, err := NewFile(tmpFile)
 	if err != nil {
 		t.Fatalf("failed to create io_uring file: %v", err)
@@ -19,7 +21,7 @@ func TestFile(t *testing.T) {
 	content := []byte("a test string to check writing works 😀 with non-unicode input")
 	n, err := f.Write(content)
 	if n != len(content) {
-		t.Errorf("mismatch between reported written len and content len: want %d, got %d", len(content), n)
+		t.Errorf("mismatch between written len and content len: want %d, got %d", len(content), n)
 	}
 	if err != nil {
 		t.Errorf("file write failed: %v", err)