ANDROID: fuse-bpf: Fix bpf_test_xattr testcase error

Skipped selinux xattr checking.

Bug: 279996548
Test: fuse_test compiles and passes
Signed-off-by: Weizhao Ouyang <[email protected]>
(cherry picked from https://android-review.googlesource.com/q/commit:dbfbd63968743deaf9854df8952874d00c2d3755)
Merged-In: I56ac1d5fe3865310a99c091e9688e70aa515e96f
Change-Id: I56ac1d5fe3865310a99c091e9688e70aa515e96f

tools/testing/selftests/filesystems/fuse/fuse_test.c

@@ -1026,6 +1026,7 @@ static int bpf_test_xattr(const char *mount_dir)
 	const size_t xattr_size = sizeof(xattr_value);
 	char xattr_value_ret[256];
 	ssize_t xattr_size_ret;
+	ssize_t xattr_size_ret_se;
 	int result = TEST_FAILURE;
 	int fd = -1;
 	int src_fd = -1;
@@ -1056,9 +1057,8 @@ static int bpf_test_xattr(const char *mount_dir)
 
 	TESTSYSCALL(s_listxattr(s_path(s(mount_dir), s(file_name)),
 				xattr_value_ret, sizeof(xattr_value_ret),
-				&xattr_size_ret));
+				&xattr_size_ret_se));
 	TESTEQUAL(bpf_test_trace("listxattr"), 0);
-	TESTEQUAL(xattr_size_ret, 0);
 
 	TESTSYSCALL(s_setxattr(s_path(s(mount_dir), s(file_name)), xattr_name,
 			       xattr_value, xattr_size, 0));
@@ -1068,8 +1068,8 @@ static int bpf_test_xattr(const char *mount_dir)
 				xattr_value_ret, sizeof(xattr_value_ret),
 				&xattr_size_ret));
 	TESTEQUAL(bpf_test_trace("listxattr"), 0);
-	TESTEQUAL(xattr_size_ret, sizeof(xattr_name));
-	TESTEQUAL(strcmp(xattr_name, xattr_value_ret), 0);
+	TESTEQUAL(xattr_size_ret - xattr_size_ret_se, sizeof(xattr_name));
+	TESTEQUAL(strcmp(xattr_name, xattr_value_ret + xattr_size_ret_se), 0);
 
 	TESTSYSCALL(s_getxattr(s_path(s(mount_dir), s(file_name)), xattr_name,
 			       xattr_value_ret, sizeof(xattr_value_ret),