init arg_t variables

Fixes #2

src/test/test_format.c

@@ -134,6 +134,7 @@ static void
 init_tx_arg(tx_t *tx, rec_node_t node[], rec_node_t *nptr[], arg_t *args)
 {
     init_tx(tx, node, nptr);
+    memset(args, 0, sizeof(*args));
     args->name = NULL;
     args->tag = SLT__Bogus;
 }
@@ -891,7 +892,7 @@ static const char
     rec_node_t node[NTAGS], *nptr[NTAGS];
     rec_t rec_method, rec_host, rec_url, rec_proto;
     chunk_t chunk_method, chunk_host, chunk_url, chunk_proto;
-    arg_t cargs, bargs;
+    arg_t cargs = {0}, bargs = {0};
     char *str;
     size_t len;
 
@@ -1437,7 +1438,7 @@ static const char
 *test_format_VCL_disp(void)
 {
     tx_t tx;
-    arg_t args;
+    arg_t args = {0};
     char *str, hitmiss[] = "m", handling[] = "n";
     size_t len;
 
@@ -1721,7 +1722,7 @@ static const char
 *test_format_p_vxid(void)
 {
     tx_t tx;
-    arg_t args;
+    arg_t args = {0};
     char *str;
     size_t len;