Remove close of datachan
Remove close of datachan

Closing of the dataChan right after the closeChan can cause a race in select statements.
If select attemps the dataChan operation then a panic will happen.
Since dataChan is not used for synchronization, the closure of closeChan is enough to stop all data operations.

Fixes #60

Signed-off-by: Derek McGowan <e1c79a582b6629e6b39e9679f4bb964d25db4aa8@mcgstyle.net> (github: dmcgowan)

liggitt/spdystream