drm/i915/gem: Cleanup shadow batch after I915_EXEC_SECURE

Tidy up after a call to eb_parse() if a later bind fails.

Closes: https://gitlab.freedesktop.org/drm/intel/issues/1312Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200225082233.274530-4-chris@chris-wilson.co.uk

drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c

@@ -2713,7 +2713,7 @@ i915_gem_do_execbuffer(struct drm_device *dev,
 		vma = i915_gem_object_ggtt_pin(eb.batch->obj, NULL, 0, 0, 0);
 		if (IS_ERR(vma)) {
 			err = PTR_ERR(vma);
-			goto err_vma;
+			goto err_parse;
 		}
 
 		eb.batch = vma;
@@ -2792,6 +2792,7 @@ i915_gem_do_execbuffer(struct drm_device *dev,
 err_batch_unpin:
 	if (eb.batch_flags & I915_DISPATCH_SECURE)
 		i915_vma_unpin(eb.batch);
+err_parse:
 	if (eb.batch->private)
 		intel_engine_pool_put(eb.batch->private);
 err_vma: