fix cpplint errors

Author: MarqRazz

include/sdf/Camera.hh

@@ -352,8 +352,8 @@ namespace sdf
     /// object's camera_info message header is expressed.
     /// Note: while Gazebo interprets the camera frame to be looking towards +X,
     /// other tools, such as ROS interprets this frame as looking towards +Z.
-    /// The Camera sensor assumes that the color and depth images are captured at
-    /// the same frame_id.
+    /// The Camera sensor assumes that the color and depth images are captured
+    /// at the same frame_id.
     /// \return The name of the frame this camera uses in its camera_info topic.
     public: const std::string OpticalFrameId() const;
 

src/Camera.cc

@@ -354,7 +354,7 @@ Errors Camera::Load(ElementPtr _sdf)
   // Load the optional optical_frame_id value.
   if (_sdf->HasElement("optical_frame_id"))
   {
-    this->dataPtr->opticalFrameId = _sdf->Get<std::string>("optical_frame_id", 
+    this->dataPtr->opticalFrameId = _sdf->Get<std::string>("optical_frame_id",
         this->dataPtr->opticalFrameId).first;
   }
 
@@ -1172,7 +1172,8 @@ sdf::ElementPtr Camera::ToElement() const
         this->SegmentationType());
   }
 
-  elem->GetElement("optical_frame_id")->Set<std::string>(this->OpticalFrameId());
+  elem->GetElement("optical_frame_id")->Set<std::string>(
+      this->OpticalFrameId());
 
   return elem;
 }