flistxattr01: enlarging the buffer to accommodate multi-extended attribute OS

The security policy of the KylinOS needs to automatically assign
extended attributes to newly created temporary files. At present, the
number of extended attributes in the system is quite large, and the size
of the cache area for obtaining extended attributes in the flistxattr01
test case is limited. If we continue to add extended attributes, the
list of extended attributes will exceed 64 bytes, and an error will be
reported (ERANGE) like this:

kylin@kylin-XYABC:/opt/ltp/testcases/bin$ sudo ./flistxattr01
tst_test.c:1244: INFO: Timeout per run is 0h 05m 00s
flistxattr01.c:63: FAIL: flistxattr() failed: ERANGE (34)

Summary:
passed   0
failed   1
skipped  0
warnings 0

Signed-off-by: Frank He <[email protected]>
Reviewed-by: Cyril Hrubis <[email protected]>

Author: Frank He

testcases/kernel/syscalls/flistxattr/flistxattr01.c

@@ -47,7 +47,7 @@ static int has_attribute(const char *list, int llen, const char *attr)
 
 static void verify_flistxattr(void)
 {
-	char buf[64];
+	char buf[128];
 
 	TEST(flistxattr(fd, buf, sizeof(buf)));
 	if (TST_RET == -1) {