capabilities: remove cap_mmap_file()

The cap_mmap_file() LSM callback returns the default value for the
security_mmap_file() LSM hook and can be safely removed.

Signed-off-by: Paul Moore <paul@paul-moore.com>
Reviewed-by: Casey Schaufler <casey@schaufler-ca.com>
Reviewed-by: Serge Hallyn <serge@hallyn.com>
Signed-off-by: Serge Hallyn <sergeh@kernel.org>

security/commoncap.c

@@ -1428,12 +1428,6 @@ int cap_mmap_addr(unsigned long addr)
 	return ret;
 }
 
-int cap_mmap_file(struct file *file, unsigned long reqprot,
-		  unsigned long prot, unsigned long flags)
-{
-	return 0;
-}
-
 #ifdef CONFIG_SECURITY
 
 static const struct lsm_id capability_lsmid = {
@@ -1453,7 +1447,6 @@ static struct security_hook_list capability_hooks[] __ro_after_init = {
 	LSM_HOOK_INIT(inode_killpriv, cap_inode_killpriv),
 	LSM_HOOK_INIT(inode_getsecurity, cap_inode_getsecurity),
 	LSM_HOOK_INIT(mmap_addr, cap_mmap_addr),
-	LSM_HOOK_INIT(mmap_file, cap_mmap_file),
 	LSM_HOOK_INIT(task_fix_setuid, cap_task_fix_setuid),
 	LSM_HOOK_INIT(task_prctl, cap_task_prctl),
 	LSM_HOOK_INIT(task_setscheduler, cap_task_setscheduler),