pidgin/pidgin

Zero out some memory that scanbuild thought might be used
release-2.x.y
2021-06-03, Gary Kramlich
515660e0556d
Zero out some memory that scanbuild thought might be used

Testing Done:
Verified that scanbuild no longer detected the errors.

Reviewed at https://reviews.imfreedom.org/r/716/
For information on writing a plugin for Purple, Pidgin or Finch, go
http://developer.pidgin.im and click on API. From there, see the
HOWTOs in the "Related Pages" section.
You can also generate this documentation locally by installing
doxygen and graphviz dot, then running "make docs" in the
source tree. The documentation will be in the docs/html directory.