softwires: avoid unnecessary allocations

diff --git a/src/script.c b/src/script.c
index 98fc6e9989bcf3fa3a206cffc998c0ec4d486c46..f350ea79e2850d50d51e25e261ca7a5f2b78459e 100644 (file)
--- a/src/script.c
+++ b/src/script.c
@@ -228,6 +228,9 @@ static void s46_to_env(enum odhcp6c_state state, const uint8_t *data, size_t len
        const char *name = (state == STATE_S46_MAPE) ? "MAPE" :
                        (state == STATE_S46_MAPT) ? "MAPT" : "LW4O6";
 
+       if (len == 0)
+               return;
+
        char *str;
        size_t strsize;