The bcm2835_timer_init() function emits an error message in case of a memory
allocation failure. This is pointless as the mm core does that already.

Remove this message.

This issue was detected by using the Coccinelle software.
Signed-off-by: NMarkus Elfring <elfring@users.sourceforge.net>
Signed-off-by: NDaniel Lezcano <daniel.lezcano@linaro.org>