Revert "CRED: Fix regression in cap_capable() as shown up by sys_faccessat() [ver #2]"

This reverts commit 14eaddc967b16017d4a1a24d2be6c28ecbe06ed8.

David has a better version to come.
diff --git a/kernel/capability.c b/kernel/capability.c
index df62f53..36b4b4d 100644
--- a/kernel/capability.c
+++ b/kernel/capability.c
@@ -308,7 +308,7 @@
 		BUG();
 	}
 
-	if (security_capable(cap) == 0) {
+	if (has_capability(current, cap)) {
 		current->flags |= PF_SUPERPRIV;
 		return 1;
 	}