pidgin/pidgin

Fix a crash in the wincred providered when adding a password.

Something about the way the freeing works on Windows causes a segfault if we memset the memory to 0 first.

Testing Done:
Created a new account, stored the password, verified it was in the Credential Manager and that Pidgin didn't crash.

Reviewed at https://reviews.imfreedom.org/r/622/
if PLUGINS
subdir('kwallet')
if nettle.found()
internalkeyring_plugin = library('internalkeyring', 'internalkeyring.c',
dependencies : [nettle, libpurple_dep],
name_prefix : '',
install : true, install_dir : PURPLE_PLUGINDIR)
endif
if secretservice.found()
secretsservice_plugin = library('secretservice', 'secretservice.c',
dependencies : [secretservice, libpurple_dep],
name_prefix : '',
install : true, install_dir : PURPLE_PLUGINDIR)
endif
if IS_WIN32
wincred_plugin = library('wincred', 'wincred.c',
dependencies : [libpurple_dep],
name_prefix : '',
install : true, install_dir : PURPLE_PLUGINDIR)
endif
endif # PLUGINS