m68knommu: Fix printk() format in free_initrd_mem()

arch/m68k/mm/init_no.c:123: warning: format "%d" expects type "int", but argument 2 has type "long unsigned int"

And use pr_notice() while we're at it.

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Greg Ungerer <gerg@uclinux.org>