lq: make sure that info_head != NULL
lq: make sure that info_head != NULL

Coverity:
CID 739652 (#1 of 1): Explicit null dereferenced (FORWARD_NULL)
At (88): Dereferencing null pointer "info_head".

Signed-off-by: Ferry Huberts <66e11f9f5d965b69497c7e73d5e808f8b13c1218@pelagic.nl>

diogomg/olsrd-binary-heap,zioproto/olsrd,acinonyx/olsrd,diogomg/olsrd-binary-heap,sebkur/olsrd,diogomg/olsrd,diogomg/olsrd-binary-heap,zioproto/olsrd,diogomg/olsrd,diogomg/olsrd-binary-heap,tdz/olsrd,diogomg/olsrd,diogomg/olsrd-binary-heap,sebkur/olsrd,sebkur/olsrd,zioproto/olsrd,zioproto/olsrd,cholin/olsrd,sebkur/olsrd,diogomg/olsrd,tdz/olsrd,sebkur/olsrd,ninuxorg/olsrd,acinonyx/olsrd,acinonyx/olsrd,nolith/olsrd,diogomg/olsrd-binary-heap,tdz/olsrd,ninuxorg/olsrd,sebkur/olsrd,diogomg/olsrd,nolith/olsrd,cholin/olsrd,diogomg/olsrd-binary-heap,nolith/olsrd,tdz/olsrd,tdz/olsrd,nolith/olsrd,cholin/olsrd,ninuxorg/olsrd,zioproto/olsrd,cholin/olsrd,acinonyx/olsrd,cholin/olsrd,ninuxorg/olsrd,acinonyx/olsrd,ninuxorg/olsrd,nolith/olsrd,diogomg/olsrd,diogomg/olsrd