path_simplify_full()/path_simplify() are changed to allow a NULL path, for which a NULL is returned. Generally, callers have already asserted before that the argument is nonnull. This way path_simplify_full()/path_simplify() and path_simplify_alloc() behave consistently. In sd-device.c, logging in device_set_syspath() is intentionally dropped: other branches don't log. In mount-tool.c, logging in parse_argv() is changed to log the user-specified value, not the simplified string. In an error message, we should show the actual argument we got, not some transformed version.
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