fix clang build

a new warning -Wunused-but-set-variable was introduced recently to clang

1 files changed, 1 insertions, 2 deletions

diff --git a/mysys/mf_iocache.c b/mysys/mf_iocache.c
index 8ade76e922e..0b19aaf9015 100644
--- a/mysys/mf_iocache.c
+++ b/mysys/mf_iocache.c
@@ -1384,7 +1384,7 @@ static void copy_to_read_buffer(IO_CACHE *write_cache,
 
 static int _my_b_seq_read(IO_CACHE *info, uchar *Buffer, size_t Count)
 {
-  size_t length, diff_length, left_length= 0, save_count, max_length;
+  size_t length, diff_length, save_count, max_length;
   my_off_t pos_in_file;
   save_count=Count;
 
@@ -1435,7 +1435,6 @@ static int _my_b_seq_read(IO_CACHE *info, uchar *Buffer, size_t Count)
       */
       goto read_append_buffer;
     }
-    left_length+=length;
     diff_length=0;
   }