bsd: Remove redundant NULL check in bsd_init()

drv cannot be NULL here (it is dereferenced even on the preceding line)
and anyway, os_free(NULL) is allowed, so remove the redundant check.

Signed-off-by: Jouni Malinen <j@w1.fi>

src/drivers/driver_bsd.c

@@ -861,8 +861,7 @@ bad:
 	if (drv->sock >= 0)
 		close(drv->sock);
 	os_free(drv->event_buf);
-	if (drv != NULL)
-		os_free(drv);
+	os_free(drv);
 	return NULL;
 }