Remove a spurious deadlock when >= 2 insert transactions have to wait because there is a next-key lock set


innobase/lock/lock0lock.c:
  Remove a spurious deadlock when >= 2 insert transactions have to wait because there is a next-key lock set
innobase/include/lock0lock.h:
  Remove a spurious deadlock when >= 2 insert transactions have to wait because there is a next-key lock set