bug#21154: 24.5.50; LaTeX mode complains about mismatched parentheses on end commands

[Jeff Clough]

When writing LaTeX, typing the closing curly brace of an end
command (\end{document} for instance) causes a "Mismatched parentheses"
complaint to appear in the minibuffer, even when this seems to be false.

Steps to reproduce:

Create a new ".tex" file with the following contents (note the missing
curly brace at the very end...

\documentclass{article}
\begin{document}
\end{document

Watch the minibuffer, type the closing curly brace, and witness the
complaint. The only ever appears to happen on an end command, and it
happens on every single end command no matter where it appears.



In GNU Emacs 24.5.50.1 (x86_64-unknown-linux-gnu, GTK+ Version 3.10.8)
 of 2015-07-02 on jeff-Inspiron-3537
Repository revision: a5e6f33b4c8222ad62fdd7ff4bb0f8c5fac432c1
Windowing system distributor `The X.Org Foundation', version 11.0.11600000
System Description:     Ubuntu 14.04.2 LTS

Important settings:
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  value of $XMODIFIERS: @im=ibus
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Major mode: Shell

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Saving /home/jeff/.newsrc.eld...
Saving file /home/jeff/.newsrc.eld...
Wrote /home/jeff/.newsrc.eld
Saving /home/jeff/.newsrc.eld...done

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