nsf.c

* nsf.c (GetObjectFromObj, TclDeletesObject): Remove two earlier fixes to deal with ::nsf::object::alloc failing under cmd deletion/recreation. The issue has been tackled more generally by a Tcl-side fix. Background: Since 2005 (commit fcb9ab1df3a9b2d1), in Tcl the cmdEpoch state in delete traces and delete callbacks (deleteProcs, destructors) has been compromised. Bumping the epoch of the cmd under deletion before executing the traces and callbacks had the potential of caching the cmd under in Tcl_Objs beyond its deletion (at least in our code path). In July 2017 (8.7a, commit 54fac92610d3bdd9), this potential realised by removing a guard expression (CMD_IS_DELETED) in the Tcl_Obj cache invalidation logic, which had protected from such invalid caches (as a side effect). As of today (8.7a, commit 71fa1f9c91), the underlying timing problem of epoch bumping has been resolved.