FIX: Coverity fix with resource leakage

ADD: Implemented a addon to "hf mf nested"  if there is KEY_A 's found but not the same KEY_B,  try just read it from tag.
Makes the command a bit slower when it does these reads.   Plus some annoying debug statements,

CHG: changed the output for "hf mf nested"  to write Key A or B instead of 0 & 1..