BACKPORT: coresight: etr_buf: Consolidate refcount initialization

Backport: dev_dbg() in context code is different from upstream.

(Upstream commit 5774a34fc802dbec0c1e7afd0c6737a0233e64ec).

We now use refcounts for the etr_buf users. Let us initialize it
while we allocate it.

Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Link: https://lore.kernel.org/r/20190829202842.580-5-mathieu.poirier@linaro.org


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Bug: 140266694
Change-Id: I05801ffd675b1b9996e7c0e624828eb46f6bebcf
Signed-off-by: Yabin Cui <yabinc@google.com>