v3dv: reset subpass index at render pass end

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6766>
diff --git a/src/broadcom/vulkan/v3dv_cmd_buffer.c b/src/broadcom/vulkan/v3dv_cmd_buffer.c
index c207c53..8a8783f 100644
--- a/src/broadcom/vulkan/v3dv_cmd_buffer.c
+++ b/src/broadcom/vulkan/v3dv_cmd_buffer.c
@@ -1843,8 +1843,9 @@
    }
 
    /* We are no longer inside a render pass */
-   state->pass = NULL;
    state->framebuffer = NULL;
+   state->pass = NULL;
+   state->subpass_idx = -1;
 }
 
 VkResult