net: qrtr: Invoke sk_error_report() after setting sk_err

Rather than manually waking up any context sleeping on the sock to
signal an error we should call sk_error_report(). This has the added
benefit that in-kernel consumers can override this notification with
its own callback.

Change-Id: Ie8fcdd1499439e6cea06812feac41acfb8180b54
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Patch-mainline: netdev @ 06/09/17, 23:03
[clew@codeaurora.org: fix notification typo in commit msg]
Signed-off-by: Chris Lew <clew@codeaurora.org>