clocksource/drivers/bcm2835: Remove message on memory allocation failure

[SF Markus Elfring]

>> https://git.linaro.org/people/daniel.lezcano/linux.git/commit/?h=clockevents/4.14&id=fd388bc07c2ca854f28f405bb65470647499dcaa
>>
>> Do you disagree to my suggestion to amend also the commit subject?
> 
> Just wanted to keep it short.

I propose to reconsider the preposition which should be used in the title.

Regards,
Markus