test: log: log_process: Improve debugging on process exit failures

When the process fails to run and exit normally, the test prints an
error message that provides little information:

	process did not exit normally

Expand the error message to print the exit status to make debugging
easier.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

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