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Use C-style strings.

Chris Lalancette requested to merge clalancette1/ros2_v4l2_camera:clalancette/use-c-style-strings into foxy

As of https://github.com/ros2/rclcpp/pull/1442 , the RCLCPP_ macros no longer accept std::string arguments, and only C-style strings.

https://index.ros.org/doc/ros2/Releases/Release-Galactic-Geochelone/#change-in-rclcpp-s-logging-macros has more information about it.

This PR changes all of the use of std::string to C-style strings, which will allow this package to build against Rolling (and hence Galactic).

Note that this change is entirely backwards compatible, so it can be used for both Foxy and Rolling.

Signed-off-by: Chris Lalancette clalancette@openrobotics.org

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