diag: Release diag wakesource on socket error

There is a possibility of exiting socket read and
not releasing diag wakesource due to socket error
at the time of connection reset. The patch releases
diag wakesource on socket error.

Change-Id: I9862395207f2dc2f723b06e176ba25bd001c189d
Signed-off-by: Hardik Arya <harya@codeaurora.org>