diag: Limit printing error msg in certain cases

Diag driver shouldn't warn the users if the remote peripherals
are late in reading data from the socket. Do not print an error
message in this case.

Change-Id: I5f998ca751cd5d03623d23014653089b9e0dc770
Signed-off-by: Ravi Aravamudhan <aravamud@codeaurora.org>