hostapd: fix building with CONFIG_TLS=internal

The patch recently added for CVE-2021-30004 broke compilation with
CONFIG_TLS=internal. This adds the necessary function to let it
compile again.

Signed-off-by: Alexander Vickberg <wickbergster@gmail.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-oe/recipes-connectivity/hostapd/hostapd/0001-Prepare-for-CVE-2021-30004.patch.patch

@@ -0,0 +1,45 @@
+From 14fab0772db19297c82dd1b8612c9335369dce41 Mon Sep 17 00:00:00 2001
+From: Alexander Vickberg <wickbergster@gmail.com>
+Date: Mon, 17 May 2021 17:54:13 +0200
+Subject: [PATCH] Prepare for CVE-2021-30004.patch
+
+Without this building fails for CONFIG_TLS=internal
+
+Signed-off-by: Alexander Vickberg <wickbergster@gmail.com>
+---
+ src/tls/asn1.h       | 6 ++++++
+ src/utils/includes.h | 1 +
+ 2 files changed, 7 insertions(+)
+
+diff --git a/src/tls/asn1.h b/src/tls/asn1.h
+index 6bd7df5..77b94ef 100644
+--- a/src/tls/asn1.h
++++ b/src/tls/asn1.h
+@@ -66,6 +66,12 @@ void asn1_oid_to_str(const struct asn1_oid *oid, char *buf, size_t len);
+ unsigned long asn1_bit_string_to_long(const u8 *buf, size_t len);
+ int asn1_oid_equal(const struct asn1_oid *a, const struct asn1_oid *b);
+ 
++static inline bool asn1_is_null(const struct asn1_hdr *hdr)
++{
++	return hdr->class == ASN1_CLASS_UNIVERSAL &&
++		hdr->tag == ASN1_TAG_NULL;
++}
++
+ extern struct asn1_oid asn1_sha1_oid;
+ extern struct asn1_oid asn1_sha256_oid;
+ 
+diff --git a/src/utils/includes.h b/src/utils/includes.h
+index 75513fc..741fc9c 100644
+--- a/src/utils/includes.h
++++ b/src/utils/includes.h
+@@ -18,6 +18,7 @@
+ 
+ #include <stdlib.h>
+ #include <stddef.h>
++#include <stdbool.h>
+ #include <stdio.h>
+ #include <stdarg.h>
+ #include <string.h>
+-- 
+2.25.1
+

meta-oe/recipes-connectivity/hostapd/hostapd_2.9.bb

@@ -11,6 +11,7 @@ SRC_URI = " \
     file://defconfig \
     file://init \
     file://hostapd.service \
+    file://0001-Prepare-for-CVE-2021-30004.patch.patch \
     file://CVE-2019-16275.patch \
     file://CVE-2019-5061.patch \
     file://CVE-2021-0326.patch \