[Asterisk-code-review] app_read: Fix null pointer crash (asterisk[19])

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Hello Joshua Colp, Friendly Automation, 

I'd like you to reexamine a change. Please visit

    https://gerrit.asterisk.org/c/asterisk/+/16550

to look at the new patch set (#3).

Change subject: app_read: Fix null pointer crash
......................................................................

app_read: Fix null pointer crash

If the terminator character is not explicitly specified
and an indications tone is used for reading a digit,
there is no null pointer check so Asterisk crashes.
This prevents null usage from occuring.

ASTERISK-29673 #close

Change-Id: Ie941833e123c3dbfb88371b5de5edbbe065514ac
---
M apps/app_read.c
1 file changed, 3 insertions(+), 3 deletions(-)


  git pull ssh://gerrit.asterisk.org:29418/asterisk refs/changes/50/16550/3
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Gerrit-Project: asterisk
Gerrit-Branch: 19
Gerrit-Change-Id: Ie941833e123c3dbfb88371b5de5edbbe065514ac
Gerrit-Change-Number: 16550
Gerrit-PatchSet: 3
Gerrit-Owner: N A <mail at interlinked.x10host.com>
Gerrit-Reviewer: Friendly Automation
Gerrit-Reviewer: Joshua Colp <jcolp at sangoma.com>
Gerrit-Attention: N A <mail at interlinked.x10host.com>
Gerrit-MessageType: newpatchset
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