maptree.c: failure to check malloc() returns

[ttsai@…]

maptree.c:
static treeNodeObj *treeNodeCreate(rectObj rect)
{
    treeNodeObj *node;

    node = (treeNodeObj *) malloc(sizeof(treeNodeObj));
---------------------------------------------------------
shptree core dumps while trying to index a 350M+ shapefile.  Temporarily added

    if (!node) {
        perror("treeNodeCreate");
        exit(1);
    }

to exit gracefully and to provide reason for failure (ok in this instance 
since only shptree.c calls this routine).  There are numerous other places 
where results of malloc() isn't checked in maptree.c - some could be very 
frustrating in out-of-memory conditions.

Tim