Close tty_fd after resetting and before exiting

picocom.c

@@ -679,6 +679,8 @@ cleanup (int drain, int noreset, int hup)
                comments in term.c/term_exitfunc() for more. */
             flock(tty_fd, LOCK_UN);
 #endif
+            close(tty_fd);
+            tty_fd = -1;
         }
     }
 

term.c

@@ -421,6 +421,7 @@ term_exitfunc (void)
                set). */
             flock(term.fd[i], LOCK_UN);
 #endif
+            close(term.fd[i]);
             term.fd[i] = -1;
         }
     } while (0);