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fix issues reported from clang

#include <stdio.h>
#include <string.h>
#include <aitio.h>


int
main(int argc, char **argv)
{
	char *str2 = NULL, *str = NULL;
	int i, n;
	u_char ivec[16];

	if (argc < 4)
		return 1;

	printf("String=%s\nKey=%s IV=%s\n\n", argv[1], argv[2], argv[3]);
	/* encode */
	memset(ivec, 0, sizeof ivec);
	strlcpy((char*) ivec, argv[3], sizeof ivec);
	printf("io_ctr_AES() -> %d\n", (n = io_ctr_AES((u_char*) argv[1], strlen(argv[1]), 
					(u_char**) &str, (u_char*) argv[2], ivec)));
	printf("Cipher: ");
	for (i = 0; i < n; i++)
		printf("%02hhx", str[i]);
	printf("\n");

	/* decode */
	memset(ivec, 0, sizeof ivec);
	strlcpy((char*) ivec, argv[3], sizeof ivec);
	printf("io_ctr_AES() -> %d\n", (n = io_ctr_AES((u_char*) str, n, 
					(u_char**) &str2, (u_char*) argv[2], ivec)));
	printf("Plain: ");
	for (i = 0; i < n; i++)
		printf("%c", str2[i]);
	printf("\n");

	printf("\n\n");
	if (!strcmp(argv[1], str2))
		printf("%s == %s ... Test passed\n", argv[1], str2);
	else
		printf("%s != %s ... Test FAILED\n", argv[1], str2);

	if (str)
		free(str);
	if (str2)
		free(str2);

	return 0;
}