pidgin/pidgin

Fix leaked errors

14 months ago, Elliott Sales de Andrade
3fc2d2b7b7a8
Fix leaked errors

And also simplify some cases with `g_clear_error`.

Testing Done:
Compiled and ran tests in valgrind, though it never noticed these anyway.

Reviewed at https://reviews.imfreedom.org/r/2384/
subdir('disco')
subdir('gestures')
subdir('iconaway')
subdir('notify')
subdir('spellchk')
subdir('transparency')
subdir('unity', if_found : UNITY)
subdir('xmppconsole')