Fix various small memory leaks
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mock-capsule-capture-libs: Fix a memory leak
We allocated one GFile per loop iteration, but only freed the last one.
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simple-input-device: Don't leak the HID report descriptor
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tests: Don't leak list of portal backends
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pv-adverb: Don't leak temporary arrays used to build search paths
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tests: Don't leak an error
Unimportant on their own, but they contributed to a CI failure for !576 (merged).
I'm still seeing memory leaks with Debian unstable's GLib, but I think those might actually be a GLib regression: I'll continue to look into that as a non-critical-path thing.
Edited by Simon McVittie