Wait at least two seconds for DHCP client to exit

r17158

debian/changelog

@@ -27,6 +27,7 @@ netcfg (0.71) UNRELEASED; urgency=low
       + Write host-name provided to the DHCP client in order to get a lease
         on the "hostname" option line for the interface in /e/n/i
       + If the user backs up from netcfg/get_hostname, go to retry question
+      + Wait at least two seconds for DHCP client to exit  (Closes: #255984)
       + Clean up code
         . Always use spaces for indentation
         . Improve comments

dhcp.c

@@ -187,8 +187,11 @@ int poll_dhcp_client (struct debconfclient *client)
   debconf_progress_info(client, "netcfg/dhcp_progress_note");
   netcfg_progress_displayed = 1;
 
-  /* wait DHCP_SECONDS seconds for a DHCP lease */
-  while ((dhcp_pid > 0) && (seconds_slept < DHCP_SECONDS)) {
+  /* wait between 2 and DHCP_SECONDS seconds for a DHCP lease */
+  while (
+      ((dhcp_pid > 0) || (seconds_slept < 2))
+      && (seconds_slept < DHCP_SECONDS)
+  ) {
     sleep(1);
     seconds_slept++; /* Not exact but close enough */
     debconf_progress_step(client, 1);