[PATCH] powerpc/powernv: Only delay opal_rtc_read() retry when necessary

[Stewart Smith]

Michael Neuling <mikey at neuling.org> writes:

> Only delay opal_rtc_read() when busy and are going to retry.
>
> This has the advantage of possibly saving a massive 10ms off booting!
>
> Kudos to Stewart for noticing.
>
> Signed-off-by: Michael Neuling <mikey at neuling.org>

Reviewed-by: Stewart Smith <stewart at linux.vnet.ibm.com>