net-snmp: Fix build with gcc5

Fix errors seen with gcc5

Change-Id: I9c4361f3a9c25342f5c740263f551c162dce8faf
Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
Signed-off-by: Joe MacDonald <joe_macdonald@mentor.com>

meta-networking/recipes-protocols/net-snmp/net-snmp/0001-snmplib-keytools.c-Don-t-check-for-return-from-EVP_M.patch

@@ -0,0 +1,33 @@
+From d3027a227bc0f603a5b650d01f97ee1dec515be5 Mon Sep 17 00:00:00 2001
+From: Khem Raj <raj.khem@gmail.com>
+Date: Fri, 18 Sep 2015 00:28:45 -0400
+Subject: [PATCH] snmplib/keytools.c: Don't check for return from
+ EVP_MD_CTX_init()
+
+EVP_MD_CTX_init() API returns void, it fixes errors with new compilers
+
+snmplib/keytools.c: In function 'generate_Ku': error: invalid use of void expression
+
+Signed-off-by: Khem Raj <raj.khem@gmail.com>
+---
+Upstream-Status: Submitted [https://sourceforge.net/p/net-snmp/patches/1317/]
+ snmplib/keytools.c | 3 +--
+ 1 file changed, 1 insertion(+), 2 deletions(-)
+
+diff --git a/snmplib/keytools.c b/snmplib/keytools.c
+index 0ccb3a6..880fc14 100644
+--- a/snmplib/keytools.c
++++ b/snmplib/keytools.c
+@@ -153,8 +153,7 @@ generate_Ku(const oid * hashtype, u_int hashtype_len,
+     ctx = EVP_MD_CTX_create();
+ #else
+     ctx = malloc(sizeof(*ctx));
+-    if (!EVP_MD_CTX_init(ctx))
+-        return SNMPERR_GENERR;
++    EVP_MD_CTX_init(ctx);
+ #endif
+ #ifndef NETSNMP_DISABLE_MD5
+     if (ISTRANSFORM(hashtype, HMACMD5Auth)) {
+-- 
+2.5.2
+

meta-networking/recipes-protocols/net-snmp/net-snmp_5.7.3.bb

@@ -20,6 +20,7 @@ SRC_URI = "${SOURCEFORGE_MIRROR}/net-snmp/net-snmp-${PV}.zip \
         file://run-ptest \
         file://dont-return-incompletely-parsed-varbinds.patch \
         file://0001-config_os_headers-Error-Fix.patch \
+        file://0001-snmplib-keytools.c-Don-t-check-for-return-from-EVP_M.patch \
 "
 SRC_URI[md5sum] = "9f682bd70c717efdd9f15b686d07baee"
 SRC_URI[sha256sum] = "e8dfc79b6539b71a6ff335746ce63d2da2239062ad41872fff4354cafed07a3e"