lindebugfs: Add `debugfs_create_file_size()`

[dumbbell]

Summary

This is the same as debugfs_create_file() but takes the initial size of the file. In FreeBSD, the given size is ignored and debugfs_create_file() is called.

This is part of the update of the DRM drivers to Linux 5.13.

[bz]

sys/compat/lindebugfs/lindebugfs.c

219

__unused ?

[dumbbell]

Re-upload patch with context.

[emaste]

LGTM but maybe worth a XXX comment on debugfs_create_file_size noting that we're ignoring the size?

[manu]

In D37914#861999, @emaste wrote:

LGTM but maybe worth a XXX comment on debugfs_create_file_size noting that we're ignoring the size?

Same comment.

[dumbbell]

Address @emaste comment.