cmMallocDebug.c:Fixed bug in cmMdAllocStr() where terminating zero was not

always inserted.

cmMallocDebug.c

   n += 1;
   cmChar_t* cp = cmMdAllocate(orgStrPtr,n,sizeof(cmChar_t),flags);
   strncpy(cp,str,n);
+  cp[n-1] = 0;
   return cp;
 }