media: amphion: ensure the bitops don't cross boundaries

the supported_instance_count determine the instance index range,
it shouldn't exceed the bits number of instance_mask,
otherwise the bitops of instance_mask may cross boundaries

Fixes: 9f599f35 ("media: amphion: add vpu core driver")
Reviewed-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
Signed-off-by: Ming Qian <ming.qian@nxp.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>

drivers/media/platform/amphion/vpu_core.c

@@ -88,6 +88,8 @@ static int vpu_core_boot_done(struct vpu_core *core)
 
 		core->supported_instance_count = min(core->supported_instance_count, count);
 	}
+	if (core->supported_instance_count >= BITS_PER_TYPE(core->instance_mask))
+		core->supported_instance_count = BITS_PER_TYPE(core->instance_mask);
 	core->fw_version = fw_version;
 	vpu_core_set_state(core, VPU_CORE_ACTIVE);