all: Use NULL instead of "" when calling mp_raise exception helpers.

This is the established way of doing it and reduces code size by a little
bit.

1 files changed, 1 insertions, 1 deletions

diff --git a/extmod/modlwip.c b/extmod/modlwip.c
index f7e776af9..bbb01b5d7 100644
--- a/extmod/modlwip.c
+++ b/extmod/modlwip.c
@@ -1032,7 +1032,7 @@ STATIC mp_obj_t lwip_socket_sendall(mp_obj_t self_in, mp_obj_t buf_in) {
             break;
         }
         case MOD_NETWORK_SOCK_DGRAM:
-            mp_raise_NotImplementedError("");
+            mp_raise_NotImplementedError(NULL);
             break;
     }