Simplify use of GCancellable

g_cancellable_cancell can be called without checking for a NULL value.
Use g_clear_object instead of g_object_unref
3 jobs for <span class="ref-name">cancellable-simplification</span> in 13 minutes and 8 seconds (queued for 10 seconds)
Status Job ID Name Coverage
  Build
passed #40620
build

00:07:00

 
  Test
passed #40621
test

00:06:08

 
  Delivery
manual #40622
allowed to fail manual
packaging