For a simple static string, use panic_str() which prevents calling
printf needlessly.
Signed-off-by: Sjoerd Simons <sjoerd.simons@collabora.co.uk>
Reviewed-by: Simon Glass <sjg@chromium.org>
 #ifdef CONFIG_SPL_SYS_MALLOC_SIMPLE
        if (CONFIG_SPL_STACK_R_MALLOC_SIMPLE_LEN) {
                if (!(gd->flags & GD_FLG_SPL_INIT))
-                       panic("spl_init must be called before heap reloc");
+                       panic_str("spl_init must be called before heap reloc");
 
                ptr -= CONFIG_SPL_STACK_R_MALLOC_SIMPLE_LEN;
                gd->malloc_base = ptr;