pidgin/pidgin

Fix some issues scanbuild found in gtkthemes.c
release-2.x.y
2021-06-01, Gary Kramlich
f2cec5958ed7
Fix some issues scanbuild found in gtkthemes.c

Testing Done:
Verified scanbuild no longer detected an issue.

Reviewed at https://reviews.imfreedom.org/r/697/
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.