apparmor: fix doc warning

Fix gcc W=1 warning:

security/apparmor/apparmorfs.c:2125: warning: Function parameter or member 'p' not described in '__next_profile'
Signed-off-by: NChenXiaoSong <chenxiaosong2@huawei.com>
Signed-off-by: NJohn Johansen <john.johansen@canonical.com>

security/apparmor/apparmorfs.c

@@ -2115,7 +2115,7 @@ static struct aa_profile *__first_profile(struct aa_ns *root,
 
 /**
  * __next_profile - step to the next profile in a profile tree
- * @profile: current profile in tree (NOT NULL)
+ * @p: current profile in tree (NOT NULL)
  *
  * Perform a depth first traversal on the profile tree in a namespace
  *