Replace t_malloc with t_malloc0 or t_malloc_no0

Plain t_malloc was deprecated in dovecot.

src/lib-sieve/plugins/spamvirustest/ext-spamvirustest-common.c

@@ -69,7 +69,7 @@ static bool _regexp_compile
 	errsize = regerror(ret, regexp, NULL, 0);
 
 	if ( errsize > 0 ) {
-		char *errbuf = t_malloc(errsize);
+		char *errbuf = t_malloc0(errsize);
 
 		(void)regerror(ret, regexp, errbuf, errsize);
 

src/lib-sieve/sieve-binary-file.c

@@ -630,7 +630,7 @@ static bool _file_lazy_read
 static const void *_file_lazy_load_data
 (struct sieve_binary_file *file, off_t *offset, size_t size)
 {
-	void *data = t_malloc(size);
+	void *data = t_malloc_no0(size);
 
 	if ( _file_lazy_read(file, offset, data, size) ) {
 		return data;

src/lib-sieve/util/program-client-local.c

@@ -149,8 +149,8 @@ static int program_client_local_connect
 
 		efds = array_get_modifiable(&pclient->extra_fds, &xfd_count);
 		if (	xfd_count > 0 ) {
-			parent_extra_fds = t_malloc(sizeof(int) * xfd_count);
-			child_extra_fds = t_malloc(sizeof(int) * xfd_count * 2 + 1);
+			parent_extra_fds = t_malloc0(sizeof(int) * xfd_count);
+			child_extra_fds = t_malloc0(sizeof(int) * xfd_count * 2 + 1);
 			for ( i = 0; i < xfd_count; i++ ) {
 				if ( pipe(extra_fd) < 0 ) {
 					i_error("pipe(extra=%d) failed: %m", extra_fd[1]);

src/managesieve/managesieve-client.c

@@ -200,7 +200,7 @@ static const char *client_stats(struct client *client)
 	struct var_expand_table *tab;
 	string_t *str;
 
-	tab = t_malloc(sizeof(static_tab));
+	tab = t_malloc_no0(sizeof(static_tab));
 	memcpy(tab, static_tab, sizeof(static_tab));
 
 	tab[0].value = dec2str(client->put_bytes);