Fix #217 issue with compiling with newer compiler

Author: jboynes

api/CanMsg.h

@@ -51,12 +51,7 @@ class CanMsg : public Printable
 
   CanMsg() : CanMsg(0, 0, nullptr) { }
 
-  CanMsg(CanMsg const & other)
-  {
-    this->id          = other.id;
-    this->data_length = other.data_length;
-    if (this->data_length && other.data)
-      memcpy(this->data, other.data, this->data_length);
+  CanMsg(CanMsg const & other) : CanMsg(other.id, other.data_length, other.data) {
   }
 
   virtual ~CanMsg() { }
@@ -65,10 +60,10 @@ class CanMsg : public Printable
   {
     if (this != &other)
     {
-      this->id          = other.id;
-      this->data_length = other.data_length;
-      if (this->data_length && other.data)
-        memcpy(this->data, other.data, this->data_length);
+      id          = other.id;
+      data_length = other.data_length;
+      if (data_length > 0)
+        memcpy(data, other.data, data_length);
     }
     return (*this);
   }