when pointer, use NULL instead of 0

cli-runopts.c

@@ -106,7 +106,7 @@ static void printhelp() {
 void cli_getopts(int argc, char ** argv) {
 	unsigned int i, j;
-	char ** next = 0;
+	char ** next = NULL;
 	enum {
 		OPT_EXTENDED_OPTIONS,
 #if DROPBEAR_CLI_PUBKEY_AUTH

cli-session.c

@@ -81,7 +81,7 @@ static const packettype cli_packettypes[] = {
 	{SSH_MSG_REQUEST_SUCCESS, ignore_recv_response},
 	{SSH_MSG_REQUEST_FAILURE, ignore_recv_response},
 #endif
-	{0, 0} /* End */
+	{0, NULL} /* End */
 };
 static const struct ChanType *cli_chantypes[] = {

dropbearkey.c

@@ -134,7 +134,7 @@ int main(int argc, char ** argv) {
 #endif
 	int i;
-	char ** next = 0;
+	char ** next = NULL;
 	char * filename = NULL;
 	enum signkey_type keytype = DROPBEAR_SIGNKEY_NONE;
 	char * typetext = NULL;

svr-runopts.c

@@ -114,7 +114,7 @@ static void printhelp(const char * progname) {
 void svr_getopts(int argc, char ** argv) {
 	unsigned int i, j;
-	char ** next = 0;
+	char ** next = NULL;
 	int nextisport = 0;
 	char* recv_window_arg = NULL;
 	char* keepalive_arg = NULL;
@@ -289,7 +289,7 @@ void svr_getopts(int argc, char ** argv) {
 			if (*next == NULL) {
 				dropbear_exit("Invalid null argument");
 			}
-			next = 0x00;
+			next = NULL;
 			if (keyfile) {
 				addhostkey(keyfile);

svr-session.c

@@ -66,7 +66,7 @@ static const packettype svr_packettypes[] = {
 	{SSH_MSG_CHANNEL_OPEN_CONFIRMATION, recv_msg_channel_open_confirmation},
 	{SSH_MSG_CHANNEL_OPEN_FAILURE, recv_msg_channel_open_failure},
 #endif
-	{0, 0} /* End */
+	{0, NULL} /* End */
 };
 static const struct ChanType *svr_chantypes[] = {