Feng Tu pointed out a division by zero error in the TFTP connect timeout

code for timeouts less than fice seconds, and also provided a fix for it.

lib/tftp.c

@@ -180,6 +180,10 @@ void tftp_set_timeouts(tftp_state_data_t *state)
     /* Average restart after 5 seconds */
     state->retry_max = timeout/5;
 
+    if(state->retry_max < 1)
+      /* avoid division by zero below */
+      state->retry_max = 1;
+
     /* Compute the re-start interval to suit the timeout */
     state->retry_time = timeout/state->retry_max;
     if(state->retry_time<1)