Suppress errors from shallow clone detection

They are just noise.

internal/git/git-http.go

@@ -125,14 +125,8 @@ func handlePostRPC(w http.ResponseWriter, r *http.Request, a *api.Response) {
 			return
 		}
 
-		isShallowClone, err = scanDeepen(bytes.NewReader(buffer.Bytes()))
+		isShallowClone = scanDeepen(bytes.NewReader(buffer.Bytes()))
 		body = io.MultiReader(buffer, r.Body)
-		if err != nil {
-			// Do not pass on the error: our failure to parse the
-			// request body should not abort the request.
-			helper.LogError(r, fmt.Errorf("parseBody (non-fatal): %v", err))
-		}
-
 	} else {
 		body = r.Body
 	}

internal/git/pktline.go

@@ -18,19 +18,16 @@ func pktFlush(w io.Writer) error {
 	return err
 }
 
-func scanDeepen(body io.Reader) (bool, error) {
-	hasDeepen := false
-
+func scanDeepen(body io.Reader) bool {
 	scanner := bufio.NewScanner(body)
 	scanner.Split(pktLineSplitter)
 	for scanner.Scan() {
-		if bytes.HasPrefix(scanner.Bytes(), []byte("deepen")) {
-			hasDeepen = true
-			break
+		if bytes.HasPrefix(scanner.Bytes(), []byte("deepen")) && scanner.Err() == nil {
+			return true
 		}
 	}
 
-	return hasDeepen, scanner.Err()
+	return false
 }
 
 func pktLineSplitter(data []byte, atEOF bool) (advance int, token []byte, err error) {

internal/git/pktline_test.go

@@ -16,10 +16,7 @@ func TestSuccessfulScanDeepen(t *testing.T) {
 	}
 
 	for _, example := range examples {
-		hasDeepen, err := scanDeepen(bytes.NewReader([]byte(example.input)))
-		if err != nil {
-			t.Fatalf("error scanning %q: %v", example.input, err)
-		}
+		hasDeepen := scanDeepen(bytes.NewReader([]byte(example.input)))
 
 		if hasDeepen != example.output {
 			t.Fatalf("scanDeepen %q: expected %v, got %v", example.input, example.output, hasDeepen)
@@ -35,14 +32,7 @@ func TestFailedScanDeepen(t *testing.T) {
 	}
 
 	for _, example := range examples {
-		hasDeepen, err := scanDeepen(bytes.NewReader([]byte(example)))
-		if err == nil {
-			t.Fatalf("expected error scanning %q", example)
-		}
-
-		t.Log(err)
-
-		if hasDeepen == true {
+		if scanDeepen(bytes.NewReader([]byte(example))) == true {
 			t.Fatalf("scanDeepen %q: expected result to be false, got true", example)
 		}
 	}