timer: Check ofp_timer_start() return value in ofp_timer_init_global()
timer: Check ofp_timer_start() return value in ofp_timer_init_global()

When starting the one second timer in ofp_timer_init_global(), check
the return value from ofp_timer_start().

Signed-off-by: Jere Leppänen <14957520de8d9815e0c353a07fe23c737f0171e9@nokia.com>
Reviewed-by: Tuomas Taipale <d030d77d5671b12fc82a6b4397d4c4cdb188b540@nokia.com>

OpenFastPath/ofp,OpenFastPath/ofp,OpenFastPath/ofp,OpenFastPath/ofp