[openfirmware] Copy paste bug in der! (PowerPC)

[Marcin Cieslak]

There is a copy+paste bug:

Index: cpu/ppc/spr.fth
===================================================================
--- cpu/ppc/spr.fth (wersja 3782)
+++ cpu/ppc/spr.fth (kopia robocza)
@@ -426,7 +426,7 @@
    mfspr  tos,der
 c;
 code der!  ( n -- )
-   mtspr immr,tos
+   mtspr der,tos
    lwz tos,0(sp)
    addi sp,sp,1cell
 c;