assert test for brt-test crash

git-svn-id: file:///svn/tokudb@1985 c7de825b-a66e-492c-adef-691d508d4ae1

newbrt/brt.c

@@ -372,7 +372,7 @@ static int brt_nonleaf_split (BRT t, BRTNODE node, BRTNODE *nodea, BRTNODE *node
 	int i;
 
 	for (i=0; i<old_n_children; i++) {
-	    int targchild = i-n_children_in_a;
+	    int targchild = i-n_children_in_a; assert(targchild >= 0);
 	    int r = toku_fifo_create(&B->u.n.buffers[targchild]);
 	    if (r!=0) return r;
 	}