[crossfire] Newly modified spring_trap() passes uninitialized ptr and crashes server.

[Kevin R. Bulgrien]

Here is a backtrace for a crash on x86_64 but not on metalforge

        http://rafb.net/paste/results/nwRjEf71.html

Uninitialized ptr... env in spring_trap is passed to get_rangevector and is
used without checking it first.

        http://rafb.net/paste/results/nHaX0I34.html

Revision 4979 modified spring_trap() 8 days, 20 hours ago

get_rangevector() call was moved up before env was initialized and
get_rangevector() assumes the pointer is good and uses it.

http://svn.sourceforge.net/viewvc/crossfire/server/branches/1.x/server/rune.c?view=diff&r1=4978&r2=4979