Fix missing discard in repo_language_stats (#16030)

Set the missing discard(1) in repo_language_stats.

Signed-off-by: Andrew Thornton <art27@cantab.net>

Co-authored-by: 6543 <6543@obermui.de>

modules/git/repo_language_stats_nogogit.go

@@ -25,11 +25,7 @@ func (repo *Repository) GetLanguageStats(commitID string) (map[string]int64, err
 	defer cancel()
 
 	writeID := func(id string) error {
-		_, err := batchStdinWriter.Write([]byte(id))
-		if err != nil {
-			return err
-		}
-		_, err = batchStdinWriter.Write([]byte{'\n'})
+		_, err := batchStdinWriter.Write([]byte(id + "\n"))
 		return err
 	}
 
@@ -85,10 +81,10 @@ func (repo *Repository) GetLanguageStats(commitID string) (map[string]int64, err
 			}
 
 			sizeToRead := size
-			discard := int64(0)
+			discard := int64(1)
 			if size > fileSizeLimit {
 				sizeToRead = fileSizeLimit
-				discard = size - fileSizeLimit
+				discard = size - fileSizeLimit + 1
 			}
 
 			_, err = contentBuf.ReadFrom(io.LimitReader(batchReader, sizeToRead))