fs: ext4: make "File System is consistent\n" a debug message

When accessing an ext2 system the message "File System is consistent\n" is
shown after each write. This is superfluous noise. Only write a debug
message.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
diff --git a/fs/ext4/ext4_journal.c b/fs/ext4/ext4_journal.c
index 1a340b4..e80f797 100644
--- a/fs/ext4/ext4_journal.c
+++ b/fs/ext4/ext4_journal.c
@@ -430,7 +430,7 @@
 			printf("Recovery required\n");
 	} else {
 		if (recovery_flag == RECOVER)
-			printf("File System is consistent\n");
+			log_debug("File System is consistent\n");
 		goto end;
 	}