diag: dci: Don't read from HSIC if previous read fails

Diag driver queues a read to diag_bridge even if the read
complete for the previous read has an error status. This
leads to continuous reads resulting in waking up the
system.

Change-Id: I59bb1f59e715611f7397ae7a7d3fb6c5bed56ea5
Signed-off-by: Ravi Aravamudhan <aravamud@codeaurora.org>