[PATCH][TRIVIAL] Update comment in arch/ppc/kernel/head.S

[Leigh Brown]

Please, apply.

diff -urNX /home/leigh/.diffex linux-2.6.1-lbb-prev/arch/ppc/kernel/head.S
linux-2.6.1-lbb/arch/ppc/kernel/head.S
--- linux-2.6.1-lbb-prev/arch/ppc/kernel/head.S	Fri Jan  9 18:22:36 2004
+++ linux-2.6.1-lbb/arch/ppc/kernel/head.S	Fri Jan  9 18:23:39 2004
@@ -117,10 +117,10 @@
  * to its proper place in memory by the boot loader.  The expected layout
  * of the regs is:
  *   r3: ptr to residual data
- *   r4: initrd_start or if no initrd then 0
- *   r5: initrd_end - unused if r4 is 0
- *   r6: Start of command line string
- *   r7: End of command line string
+ *   r4: unused
+ *   r5: unused
+ *   r6: unused
+ *   r7: unused
  *
  * This just gets a minimal mmu environment setup so we can call
  * start_here() to do the real work.
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