bpf: Fix memory leak on object 'data'

The error return path on when bpf_fentry_test* tests fail does not
kfree 'data'. Fix this by adding the missing kfree.

Addresses-Coverity: ("Resource leak")

Fixes: faeb2dce084a ("bpf: Add kernel test functions for fentry testing")
Signed-off-by: Colin Ian King <[e-mail]>
Signed-off-by: Alexei Starovoitov <[e-mail]>
Link: https://lore.kernel.org/bpf/[e-mail]

net/bpf/test_run.c

···
 	    bpf_fentry_test3(4, 5, 6) != 15 ||
 	    bpf_fentry_test4((void *)7, 8, 9, 10) != 34 ||
 	    bpf_fentry_test5(11, (void *)12, 13, 14, 15) != 65 ||
-	    bpf_fentry_test6(16, (void *)17, 18, 19, (void *)20, 21) != 111)
+	    bpf_fentry_test6(16, (void *)17, 18, 19, (void *)20, 21) != 111) {
+		kfree(data);
 		return ERR_PTR(-EFAULT);
+	}
 	return data;
 }