media: platform: allegro-dvt: Fix possible memory leak in allocate_buffers_internal()

The buffer in the loop should be released under the exception path,
otherwise there may be a memory leak here.

To mitigate this, free the buffer when allegro_alloc_buffer fails.

Fixes: f20387dfd065 ("media: allegro: add Allegro DVT video IP core driver")
Cc: <[e-mail]>
Signed-off-by: Gaosheng Cui <[e-mail]>
Signed-off-by: Hans Verkuil <[e-mail]>

drivers/media/platform/allegro-dvt/allegro-core.c

···
 		INIT_LIST_HEAD(&buffer->head);
 
 		err = allegro_alloc_buffer(dev, buffer, size);
-		if (err)
+		if (err) {
+			kfree(buffer);
 			goto err;
+		}
 		list_add(&buffer->head, list);
 	}