drm/i915/gem: Avoid accessing uninitialized context in emit_rpcs_query()

Following the error path in that function may lead to usage of
uninitialized struct i915_gem_ww_ctx object, so move call to
i915_gem_ww_ctx_init() a bit earlier.

Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Krzysztof Karas <krzysztof.karas@intel.com>
Reviewed-by: Sebastian Brzezinka <sebastian.brzezinka@intel.com>
Reviewed-by: Andi Shyti <andi.shyti@linux.intel.com>
Signed-off-by: Andi Shyti <andi.shyti@linux.intel.com>
Link: https://lore.kernel.org/r/casutxyfjv7o4ivadvbich2sq2dt22btc5wcke55r56ptgxx2h@lv7hnxrqw5rq

Author: KKaras169169

drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c

@@ -962,13 +962,14 @@ emit_rpcs_query(struct drm_i915_gem_object *obj,
 	if (IS_ERR(rpcs))
 		return PTR_ERR(rpcs);
 
+	i915_gem_ww_ctx_init(&ww, false);
+
 	batch = i915_vma_instance(rpcs, ce->vm, NULL);
 	if (IS_ERR(batch)) {
 		err = PTR_ERR(batch);
 		goto err_put;
 	}
 
-	i915_gem_ww_ctx_init(&ww, false);
 retry:
 	err = i915_gem_object_lock(obj, &ww);
 	if (!err)