drm/i915: avoid uninitialised var in eb_parse()

The backport of c9d9fdb to 5.10 in
6976f3c removed more than it should
have leading to 'batch' being used uninitialised.  The 5.13 backport and
the mainline commit did not remove the portion this patch adds back.

Signed-off-by: Jonathan Gray <jsg@jsg.id.au>
Fixes: 6976f3c ("drm/i915: Revert "drm/i915/gem: Asynchronous cmdparser"")
Cc: <stable@vger.kernel.org> # 5.10
Cc: Jason Ekstrand <jason@jlekstrand.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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

@@ -2351,6 +2351,12 @@ static int eb_parse(struct i915_execbuffer *eb)
 		eb->batch_flags |= I915_DISPATCH_SECURE;
 	}
 
+	batch = eb_dispatch_secure(eb, shadow);
+	if (IS_ERR(batch)) {
+		err = PTR_ERR(batch);
+		goto err_trampoline;
+	}
+
 	err = intel_engine_cmd_parser(eb->engine,
 				      eb->batch->vma,
 				      eb->batch_start_offset,
@@ -2377,6 +2383,7 @@ static int eb_parse(struct i915_execbuffer *eb)
 err_unpin_batch:
 	if (batch)
 		i915_vma_unpin(batch);
+err_trampoline:
 	if (trampoline)
 		i915_vma_unpin(trampoline);
 err_shadow: