CacheFiles: name i_mutex lock class explicitly

Just some cleanup.

(And note the caller of this function may, for example, call vfs_unlink
on a child, so the "1" (I_MUTEX_PARENT) really was what was intended
here.)

Signed-off-by: J. Bruce Fields <[email protected]>
Signed-off-by: David Howells <[email protected]>
Tested-By: Milosz Tanski <[email protected]>
Acked-by: Jeff Layton <[email protected]>
1 file changed