Revert "fuse: in fuse_flush only wait if someone wants the return code"

This reverts commit 5a8bee63b10f6f2f52f6d22e109a4a147409842a.

Jürg Billeter reports the following regression:

  Since v6.3-rc1 commit 5a8bee63b1 ("fuse: in fuse_flush only wait if
  someone wants the return code") `fput()` is called asynchronously if a
  file is closed as part of a process exiting, i.e., if there was no
  explicit `close()` before exit.

  If the file was open for writing, also `put_write_access()` is called
  asynchronously as part of the async `fput()`.

  If that newly written file is an executable, attempting to `execve()` the
  new file can fail with `ETXTBSY` if it's called after the writer process
  exited but before the async `fput()` has run.

Reported-and-tested-by: "Jürg Billeter" <[email protected]>
Cc: <[email protected]> # v6.3
Link: https://lore.kernel.org/all/[email protected]/
Signed-off-by: Miklos Szeredi <[email protected]>

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