net: contiki: Add NULL check to neighbor polling
The function is getting called with NULL bufs, so uip_len cannot be
called on them. The stack further down handles NULL buffers correctly.
Jira: ZEP-474
Change-Id: I85fb045ec76bea2a83c64d0f72eabba4e661f5f4
Signed-off-by:
Jaakko Hannikainen <jaakko.hannikainen@intel.com>
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