[PATCH v2] tests/intel/xe_configfs: ctx_restore_*_bb rollback on invalid input

[Smitha Balasubramanyam <smitha.balasubramanyam@intel.com>]

Add a test vector with a partially invalid second command in the
ctx_restore_*_bb invalid-case suite to ensure a malformed multi-line
BB is rejected and the stored BB remains empty (rollback).

Replaced the hardcoded "ctx_restore_post_bb" write with the computed
file name ("ctx_restore_%s_bb") in test_ctx_restore_invalid so the
invalid-case tests work for both "post" and "mid" variants.

Changes since v1:
- Fixed alignment issue
- Updated commit message

Signed-off-by: Smitha Balasubramanyam <smitha.balasubramanyam@intel.com>
---
 tests/intel/xe_configfs.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/tests/intel/xe_configfs.c b/tests/intel/xe_configfs.c
index 755524e7c..39762e030 100644
--- a/tests/intel/xe_configfs.c
+++ b/tests/intel/xe_configfs.c
@@ -225,12 +225,16 @@ static void test_ctx_restore_invalid(int configfs_device_fd, const char *type)
 		{ .test = "invalid-engine-instance",
 		  .in = "rcs0 reg 4F100 DEADBEEF",
 		},
+		{ .test = "invalid-second-command",
+		  .in = "rcs cmd 11000001 4F100 DEADBEEF\n"
+			"rcs cmd 11000001 4F10G DEADBEEF",
+		},
 	};
 	char buf[4096] = { };
 	char file[64] = { };
 
 	snprintf(file, sizeof(file), "ctx_restore_%s_bb", type);
-	igt_sysfs_set(configfs_device_fd, "ctx_restore_post_bb", "");
+	igt_sysfs_set(configfs_device_fd, file, "");
 
 	/*
 	 * These only test if command parsing is correct,
-- 
2.43.0