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ext4_journal: fix trans->data_cnt not be decremented

When buffer is not dirty this counter should be decremented.

--- a/lwext4/ext4_journal.c

+++ b/lwext4/ext4_journal.c

@@ -1365,6 +1365,9 @@

 					   BC_DIRTY)) {

 			/* The buffer has not been modified, just release

 			 * that jbd_buf. */

+			jbd_trans_remove_block_rec(journal, jbd_buf);

+			trans->data_cnt--;

+

 			jbd_buf->block.buf->end_write = NULL;

 			jbd_buf->block.buf->end_write_arg = NULL;

 			ext4_block_set(fs->bdev, &jbd_buf->block);