cam: Use the common cleanup function on failure

The different error paths in init() are out of sync. Instead of fixing
them switch to using the cleanup() function which does the right thing
for all cases.

Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>

src/cam/main.cpp

@@ -107,22 +107,23 @@ int CamApp::init(int argc, char **argv)
 			std::cout << "Camera "
 				  << std::string(options_[OptCamera])
 				  << " not found" << std::endl;
-			cm_->stop();
+			cleanup();
 			return -ENODEV;
 		}
 
 		if (camera_->acquire()) {
 			std::cout << "Failed to acquire camera" << std::endl;
-			camera_.reset();
-			cm_->stop();
+			cleanup();
 			return -EINVAL;
 		}
 
 		std::cout << "Using camera " << camera_->name() << std::endl;
 
 		ret = prepareConfig();
-		if (ret)
+		if (ret) {
+			cleanup();
 			return ret;
+		}
 	}
 
 	if (options_.isSet(OptMonitor)) {