pidgin/pidgin

Fix a few issues with the CredentialProvider code that snuck past review

2020-10-14, Gary Kramlich
569ab1326932
Fix a few issues with the CredentialProvider code that snuck past review

Testing Done:
Compiled and ran unit tests locally. Verified the warnings were gone from the unit test build and verified the warning was gone from the Purple-3.0.gir build.

Reviewed at https://reviews.imfreedom.org/r/168/
<?xml version="1.0" encoding="UTF-8"?>
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<file compressed="true">About/about.md</file>
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<file compressed="true">Accounts/actionsmenu.ui</file>
<file compressed="true">Accounts/chooser.ui</file>
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<file compressed="true">BuddyList/menu.ui</file>
<file compressed="true">Conversations/invite_dialog.ui</file>
<file compressed="true">Conversations/tab-label.css</file>
<file compressed="true">Debug/debug.ui</file>
<file compressed="true">Debug/filter.css</file>
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<file compressed="true">Plugins/dialog.ui</file>
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<file compressed="true">Prefs/vv.ui</file>
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<file compressed="true">Roomlist/roomlist.ui</file>
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<file compressed="true">Xfer/xfer.ui</file>
<file compressed="true">closebutton.ui</file>
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