selftests/bpf: Fix testing BTF dump of struct data on 32-bit

Allow the test dumping BTF of 'struct file_operations' to succeed on 32-bit
targets by accounting for varying pointer size in the expected dump output.

This avoids failures in test_progs like:

[...]
test_btf_dump_struct_data:FAIL:file_operations unexpected file_operations: actual '(struct file_operations){
        .owner = (struct module *)0xffffffff,
        .fop_flags = (fop_flags_t)4294967295,
        .llsee' != expected '(struct file_operations){
        .owner = (struct module *)0xffffffffffffffff,
        .fop_flags = (fop_flags_t)4294967295,'
[...]
torvalds#31/15   btf_dump/btf_dump: struct_data:FAIL

Fixes: 70a9241 ("selftests/bpf: Add dump type data tests to btf dump tests")
Signed-off-by: Tony Ambardar <[email protected]>

Author: guidosarducci

tools/testing/selftests/bpf/prog_tests/btf_dump.c

@@ -721,9 +721,15 @@ static void test_btf_dump_struct_data(struct btf *btf, struct btf_dump *d,
 		ret = btf_dump__dump_type_data(d, type_id, fops, type_sz, &opts);
 		ASSERT_EQ(ret, type_sz,
 			  "unexpected return value dumping file_operations");
+
+		/* account for host word-size in expected string*/
 		cmpstr =
 "(struct file_operations){\n"
+#if __SIZEOF_LONG__ == 8
 "	.owner = (struct module *)0xffffffffffffffff,\n"
+#else
+"	.owner = (struct module *)0xffffffff,\n"
+#endif
 "	.fop_flags = (fop_flags_t)4294967295,";
 
 		ASSERT_STRNEQ(str, cmpstr, strlen(cmpstr), "file_operations");