fs: ext4: Do not print mount fail message when not ext4 filesystem

Other filesystem drivers don't do this.
Signed-off-by: NMarek Behun <marek.behun@nic.cz>

fs/ext4/ext4_common.c

@@ -2343,7 +2343,7 @@ int ext4fs_mount(unsigned part_length)
 
 	/* Make sure this is an ext2 filesystem. */
 	if (le16_to_cpu(data->sblock.magic) != EXT2_MAGIC)
-		goto fail;
+		goto fail_noerr;
 
 
 	if (le32_to_cpu(data->sblock.revision_level) == 0) {
@@ -2379,6 +2379,7 @@ int ext4fs_mount(unsigned part_length)
 	return 1;
 fail:
 	printf("Failed to mount ext2 filesystem...\n");
+fail_noerr:
 	free(data);
 	ext4fs_root = NULL;