debugfs: debugfs_real_fops(): drop __must_hold sparse annotation

Currently, debugfs_real_fops() is annotated with a
__must_hold(&debugfs_srcu) sparse annotation.

With the conversion of the SRCU based protection of users against
concurrent file removals to a per-file refcount based scheme, this becomes
wrong.

Drop this annotation.

Change-Id: I959c9b4519965132794e48ddb2e160ea130ff2fd
Signed-off-by: Nicolai Stange <nicstange@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Git-commit: 055ab8e3e3d52e005d2047b14ce63551b3a8b8b5
Git-repo: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git


Signed-off-by: Tingwei Zhang <tingwei@codeaurora.org>