'find -execdir' opens too many file descriptors

Issue

• find -execdir opens too many file descriptors
• When using the -execdir option to find, the program apparently opens a new file descriptor every time it runs the command, and never closes it.
• As a result, when traversing a directory tree that contains more than $(ulimit -n) files (1024 by default), find will fail with the message:

  find: Failed to save working directory in order to run a command on `foo': Too many open files