fs/squashfs: sqfs_read: fix another memory leak

data_buffer was allocated in a loop and freed only once.

Signed-off-by: Richard Genoud <richard.genoud@posteo.net>
diff --git a/fs/squashfs/sqfs.c b/fs/squashfs/sqfs.c
index a9e803c..cfea313 100644
--- a/fs/squashfs/sqfs.c
+++ b/fs/squashfs/sqfs.c
@@ -1459,6 +1459,8 @@
 		}
 
 		data_offset += table_size;
+		free(data_buffer);
+		data_buffer = NULL;
 	}
 
 	free(finfo.blk_sizes);