Fix subtle bug in 'bk admin -C' when reallocing the heap and invalidation a pointer.
Fix subtle bug in 'bk admin -C' when reallocing the heap and
invalidation a pointer.

bk: 4fba5982QXNIjgMNPGgsEZF_N5tjzg
bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper