Avoid Overflow reading interlatency timestamps
Avoid Overflow reading interlatency timestamps

In some cases the timestamps need a double variable to be stored,
because an int variable is not enough and overflow happens, causing
the interlatency plotting to fail. Changing the variable to double
avoids this issue.

RidgeRun/gst-shark,RidgeRun/gst-shark,RidgeRun/gst-shark