test: log: log_process: Fix uninitialized variable on process exit failure

If the process fails to exit before the timeout, the
LogProcessTest::exitStatus_ variable gets used uninitialized. Fix it by
initializating to Process::NotExited.

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

test/log/log_process.cpp

@@ -139,7 +139,7 @@ private:
 	ProcessManager processManager_;
 
 	Process proc_;
-	Process::ExitStatus exitStatus_;
+	Process::ExitStatus exitStatus_ = Process::NotExited;
 	string logPath_;
 	int exitCode_;
 	int num_;