Close the -iL input file after reading.

nmap.cc

@@ -1949,6 +1949,9 @@ int nmap_main(int argc, char *argv[]) {
   num_host_exp_groups = 0;
   free(host_exp_group);
 
+  if (inputfd != NULL)
+    fclose(inputfd);
+
   printdatafilepaths();
 
   printfinaloutput();