[AUDIT] do not panic on exclude messages in audit_log_pid_context()

If we fail to get an ab in audit_log_pid_context this may be due to an exclude
rule rather than a memory allocation failure. If it was due to a memory
allocation failue we would have already paniced and no need to do it again.

Signed-off-by: Eric Paris <[e-mail]>

kernel/auditsc.c

···
 
 	ab = audit_log_start(context, GFP_KERNEL, AUDIT_OBJ_PID);
 	if (!ab)
-		return 1;
+		return rc;
 
 	audit_log_format(ab, "opid=%d oauid=%d ouid=%d oses=%d", pid, auid,
 			 uid, sessionid);