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/
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