[review] Fix latent bug in tui_copy_source_line

[Tom Tromey (Code Review)]

Tom Tromey has posted comments on this change.

Change URL: https://gnutoolchain-gerrit.osci.io/r/c/binutils-gdb/+/683
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Patch Set 1:

I'm checking this one in.


-- 
Gerrit-Project: binutils-gdb
Gerrit-Branch: master
Gerrit-Change-Id: I46cdabe6e57549983149b8f640cda5edd16fa260
Gerrit-Change-Number: 683
Gerrit-PatchSet: 1
Gerrit-Owner: Tom Tromey <tromey@sourceware.org>
Gerrit-Reviewer: Tom Tromey <tromey@sourceware.org>
Gerrit-Comment-Date: Sun, 01 Dec 2019 19:20:41 +0000
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