#5604 fix miscellaneous warnings

[Dan Eble]

Commits
1. fix warnings about implicit Input::operator=
2. fix a format-security warning
3. fix a maybe-uninitialized warning

What these have in common is that they are not type-conversion warnings. :)

https://codereview.appspot.com/577100046

[Anonymous]

Passes make, make check and a full make doc.

[Anonymous]

Patch on countdown for Nov 20th

[Anonymous]

Patch counted down - please push.

[Dan Eble]

commit 40998a6ebf59ce9fd7a8f427b7cd89370b25d3a3
Author: Dan Eble <nine.fierce.ballads@gmail.com>
Date:   Fri Nov 15 20:05:26 2019 -0500

    Issue 5604/3: fix a maybe-uninitialized warning

commit 0582c84aca9fd188affbb6923d7ab313260b1ca6
Author: Dan Eble <nine.fierce.ballads@gmail.com>
Date:   Fri Nov 15 19:41:56 2019 -0500

    Issue 5604/2: fix a format-security warning

commit f2480f12fecc6ad56141bf49652af3766ead65de
Author: Dan Eble <nine.fierce.ballads@gmail.com>
Date:   Fri Nov 15 19:30:43 2019 -0500

    Issue 5604/1: fix warnings about implicit Input::operator=

[Dan Eble]

(I was too hasty in changing the type. Fixing a format-security warning is more than maintainability.)