drm/i915/gt: remove redundant assignment to variable dw

Variable dw is being initialized with a value that is never read,
it is assigned a new value later on. The assignment is redundant
and can be removed.

Addresses-Coverity: ("Unused value")
Signed-off-by: NColin Ian King <colin.king@canonical.com>
Reviewed-by: NChris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20200222134755.134209-1-colin.king@canonical.com

drivers/gpu/drm/i915/gt/intel_engine_cs.c

@@ -639,7 +639,7 @@ static int measure_breadcrumb_dw(struct intel_context *ce)
 {
 	struct intel_engine_cs *engine = ce->engine;
 	struct measure_breadcrumb *frame;
-	int dw = -ENOMEM;
+	int dw;
 
 	GEM_BUG_ON(!engine->gt->scratch);