File net-snmp-5.7.1-old-api-double-free.patch of Package net-snmp

commit 5fd26e4fa3e000ea9c81c38ab975b7946efe2157
Author: Bart Van Assche <bvanassche@acm.org>
Date:   Wed Sep 28 17:49:55 2011 +0200

    CHANGES: agent: Avoid that netsnmp_register_old_api() failure triggers a double free.
    
    Fixes a regression introduced via commit
    aa4d47c2609e52818c9cdf1a8e2205de9a335a0a (svn r19515).

diff --git a/agent/helpers/old_api.c b/agent/helpers/old_api.c
index b1630e6..2d710b0 100644
--- a/agent/helpers/old_api.c
+++ b/agent/helpers/old_api.c
@@ -127,7 +127,7 @@ netsnmp_register_old_api(const char *moduleName,
          */
         if (netsnmp_register_handler(reginfo) != MIB_REGISTERED_OK) {
             /** netsnmp_handler_registration_free(reginfo); already freed */
-            SNMP_FREE(vp);
+            /* SNMP_FREE(vp); already freed */
         }
     }
     return SNMPERR_SUCCESS;