ospfd: Function order caused use after free.

ospfd: Function order caused use after free.

The opaque lsa that we are storing is stored on various
lists depending on it's type.  This removal from the
list was being done *after* the pointer was freed.  This
is not a good idea.  Since the use after free was just
removal from a linked list and the freeing function does
not do anything other than free data, than just switching the function
order should be sufficient.

Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com>