test-logging: Fix -Werror=maybe-uninitialized warning

Checking for uninitialized variables raises warning for file path
variables in test_logfile_write and test_logfile_lock functions.

To suppress this warning, initialize varibles to NULL. This is safe
change as result of g_build_filename is stored to them before any usage.

Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
Message-Id: <63b0fcedf7dfe799c8210b113e5dccf32414a89d.1579598240.git.mrezanin@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Robert Foley <robert.foley@linaro.org>
Signed-off-by: Thomas Huth <thuth@redhat.com>
1 file changed