LwIP: fix timeout handle logic in sys_arch_sem_wait()
LwIP: fix timeout handle logic in sys_arch_sem_wait()

Currently, sem_tickwait() sets errno to ETIMEOUT when the timeout occurs.
After the timeout of sem_tickwait(), we can get the errno by using get_errno().
This patch just adopts the previous timeout handle logic.

Change-Id: I4e9e8069a1d0f90aad6658dec59077be92977501

Conflicts:
	os/net/lwip/sys/arch/sys_arch.c

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