vkr: use vrend_printf to warn when venus is disabled

This helps identify issues when crosvm enables venus blindly.

v2: include vrend_debug.h

Signed-off-by: Chia-I Wu <olvaffe@gmail.com>
Reviewed-by: Yiwei Zhang <zzyiwei@chromium.org> (v1)

src/vkr_renderer.h

@@ -12,6 +12,7 @@
 #include <stdint.h>
 
 #include "os/os_misc.h"
+#include "vrend_debug.h"
 
 #define VKR_RENDERER_THREAD_SYNC (1u << 0)
 #define VKR_RENDERER_MULTI_PROCESS (1u << 1)
@@ -42,7 +43,7 @@ vkr_context_create(size_t debug_len, const char *debug_name);
 static inline int
 vkr_renderer_init(UNUSED uint32_t flags)
 {
-   fprintf(stderr, "Vulkan support was not enabled in virglrenderer\n");
+   vrend_printf("Vulkan support was not enabled in virglrenderer\n");
    return -1;
 }