Silence some warnings emitted by gcc and clang.

src/assert.c

@@ -46,7 +46,7 @@
 
 static void __attribute__((__noreturn__))
 VAS_Fail_default(const char *func, const char *file, int line, const char *cond,
-                 int err, enum vas_e type)
+                 enum vas_e type)
 {
     switch(type) {
     case VAS_ASSERT:
@@ -69,8 +69,8 @@ VAS_Fail_default(const char *func, const char *file, int line, const char *cond,
         assert(0 != 0);
         break;
     }
-    if (err)
-        LOG_Log(LOG_ALERT, "errno = %d (%s)", err, strerror(err));
+    if (errno)
+        LOG_Log(LOG_ALERT, "errno = %d (%s)", errno, strerror(errno));
     abort();
 }
 

src/child.c

@@ -437,8 +437,8 @@ dispatch(struct VSL_data *vsl, struct VSL_transaction * const pt[], void *priv)
     int status = DISPATCH_RETURN_OK, hasdata = 0, chunks = 0;
     dataentry *de = NULL;
     char reqend_str[REQEND_T_LEN];
-    int32_t vxid;
-    struct timeval latest_t = { 0 };
+    int32_t vxid = 0;
+    struct timeval latest_t = { 0, 0 };
     unsigned chunks_added = 0;
     (void) priv;
 
@@ -594,6 +594,7 @@ dispatch(struct VSL_data *vsl, struct VSL_transaction * const pt[], void *priv)
     }
     snprintf(reqend_str, REQEND_T_LEN, "%s=%u.%06lu", REQEND_T_VAR,
              (unsigned) latest_t.tv_sec, latest_t.tv_usec);
+    AN(vxid);
     chunks = append(de, SLT_Timestamp, vxid, reqend_str, REQEND_T_LEN - 1);
     if (chunks < 0) {
         if (debug)

src/mq/kafka/mq.c

@@ -347,7 +347,7 @@ MQ_Send(void *priv, const char *data, unsigned len, const char *key,
     REPLACE(payload, data);
     if (rd_kafka_produce(wrk->topic, RD_KAFKA_PARTITION_UA, RD_KAFKA_MSG_F_FREE,
                          payload, len, key, keylen, NULL) == -1) {
-        snprintf(wrk->errmsg, LINE_MAX,
+        snprintf(wrk->errmsg, LINE_MAX, "%s",
                  rd_kafka_err2str(rd_kafka_errno2err(errno)));
         MQ_LOG_Log(LOG_ERR, "%s message send failure (%d): %s",
                    rd_kafka_name(wrk->kafka), errno, wrk->errmsg);

src/test/test_config.c

@@ -97,7 +97,7 @@ saveConfig(const char * fname)
        perror(fname);
        return 4;
     }
-    fprintf(fp, getConfigContent());
+    fprintf(fp, "%s", getConfigContent());
     fclose ( fp );
     return 0;
 }