Get rid of mg_*asprintf

src/event.c

@@ -12,13 +12,12 @@ void mg_call(struct mg_connection *c, int ev, void *ev_data) {
 }
 
 void mg_error(struct mg_connection *c, const char *fmt, ...) {
-  char mem[256], *buf = mem;
+  char buf[64];
   va_list ap;
   va_start(ap, fmt);
-  mg_vasprintf(&buf, sizeof(mem), fmt, ap);
+  mg_vsnprintf(buf, sizeof(buf), fmt, &ap);
   va_end(ap);
   MG_ERROR(("%lu %p %s", c->id, c->fd, buf));
   c->is_closing = 1;             // Set is_closing before sending MG_EV_CALL
   mg_call(c, MG_EV_ERROR, buf);  // Let user handler to override it
-  if (buf != mem) free(buf);
 }