snmp plugin: initialize res sooner

diff --git a/src/snmp.c b/src/snmp.c
index 31beee0..4f4be12 100644 (file)
--- a/src/snmp.c
+++ b/src/snmp.c
@@ -1673,7 +1673,7 @@ static int csnmp_read_table (host_definition_t *host, data_definition_t *data)
 static int csnmp_read_value (host_definition_t *host, data_definition_t *data)
 {
   struct snmp_pdu *req;
-  struct snmp_pdu *res;
+  struct snmp_pdu *res = NULL;
   struct variable_list *vb;
 
   const data_set_t *ds;
@@ -1735,7 +1735,6 @@ static int csnmp_read_value (host_definition_t *host, data_definition_t *data)
   for (i = 0; i < data->values_len; i++)
     snmp_add_null_var (req, data->values[i].oid, data->values[i].oid_len);
 
-  res = NULL;
   status = snmp_sess_synch_response (host->sess_handle, req, &res);
 
   if ((status != STAT_SUCCESS) || (res == NULL))