mm: collapse security_vm_enough_memory() variants into a single function

Collapse security_vm_enough_memory() variants into a single function.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: James Morris <jmorris@namei.org>
diff --git a/mm/swapfile.c b/mm/swapfile.c
index d999f09..f0d7929 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -1563,6 +1563,8 @@
 	if (!capable(CAP_SYS_ADMIN))
 		return -EPERM;
 
+	BUG_ON(!current->mm);
+
 	pathname = getname(specialfile);
 	err = PTR_ERR(pathname);
 	if (IS_ERR(pathname))
@@ -1590,7 +1592,7 @@
 		spin_unlock(&swap_lock);
 		goto out_dput;
 	}
-	if (!security_vm_enough_memory(p->pages))
+	if (!security_vm_enough_memory_mm(current->mm, p->pages))
 		vm_unacct_memory(p->pages);
 	else {
 		err = -ENOMEM;