radv: compute the number of subpass attachments correctly

Only count color attachments twice if resolves are used, also
account for the depth stencil attachment if present.

Cc: 18.0 18.1 <mesa-stable@lists.freedesktop.org>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>

src/amd/vulkan/radv_pass.c

@@ -87,8 +87,8 @@ VkResult radv_CreateRenderPass(
 		subpass_attachment_count +=
 			desc->inputAttachmentCount +
 			desc->colorAttachmentCount +
-			/* Count colorAttachmentCount again for resolve_attachments */
-			desc->colorAttachmentCount;
+			(desc->pResolveAttachments ? desc->colorAttachmentCount : 0) +
+			(desc->pDepthStencilAttachment != NULL);
 	}
 
 	if (subpass_attachment_count) {